Replace netstandard test projects with tfms

Netstandard test projects are broken by design and don't support the
Microsoft.Net.Test.SDK. Replacing the netstandard tfm with the concrete
implementation tfms.

Commit migrated from https://github.com/dotnet/corefx/commit/d29c16c99c6045ee67444a7a693dd4476861c463

Ignore some System.Runtime tests on Mono (dotnet/corefx#37358)

* Add SkipOnTargetFramework(Mono) here and there

Commit migrated from https://github.com/dotnet/corefx/commit/75329f4886ca235119014c8724e1e8af94b8e37a

Handle nullable attributes on platforms that lack them

Commit migrated from https://github.com/dotnet/corefx/commit/b2097cbdcb26f7f317252334ddcce101a20b7f3d

Update ProjectNTfs to beta-27730-00 (dotnet/corefx#38045)

Commit migrated from https://github.com/dotnet/corefx/commit/f121f062a25796292eaf4da8074e8b4c3dda55ee

HttpCorrelationProtocol docs update: Add notice about W3C trace-context and deprecate flat-id spec (dotnet/corefx#38025)

* Update HttpCorrelationProtocol.md

Commit migrated from https://github.com/dotnet/corefx/commit/e23119d577e644d2c2a25419c88c1181681358e0

Remove source package related comments on internal APIs and csproj/props file. (dotnet/corefx#38004)

* Remove source package related xml comments on internal APIs.

* Update comments in csproj and related files to remove source package.

* Add some more json reader tests around different json numbers.

Commit migrated from https://github.com/dotnet/corefx/commit/0110344cd384bcfaffed2385cd9df87d956bd68b

Disable warning suppressions related to missing XML comments within (dotnet/corefx#38037)

S.T.Json.

Commit migrated from https://github.com/dotnet/corefx/commit/a2afbfffc439b775086aeca71951312e15c8281e

Enable Microsoft.Diagnostics.Runtime to be used by tests

Commit migrated from https://github.com/dotnet/corefx/commit/1a60edc784c89a8370d1f9539944f5c95261e7a8

Update to use alpine3.9 in PRs

Commit migrated from https://github.com/dotnet/corefx/commit/aa9db0538e8407f94fd780652dca05e82256fa0c

Enable MaxConnectionsPerServer_WaitingConnectionsAreCancelable again (dotnet/corefx#37933)

* enable MaxConnectionsPerServer_WaitingConnectionsAreCancelable afain

* skip with curl handler

Commit migrated from https://github.com/dotnet/corefx/commit/c6fc43c6f2b92d8e13a444217f29368159e015eb

Merge pull request dotnet/corefx#37900 from ViktorHofer/MoveToolsConfig

Move dotnet-tools config

Commit migrated from https://github.com/dotnet/corefx/commit/bd492f2084f9c6be6af5338f29a54e1c3bc65599

Remove some dependencies from source build (dotnet/corefx#37730)

* Remove some dependencies from source build

* Add back GenAPI for sourcebuild

We cannot remove GenAPI as it is needed for generating platform-not-supported
assemblies.

We will need handle this differently.  The tentative plan is that sourcebuild
will have two phases.  During the first phase we can use GenAPI and generate
source for not-supported assemblies and save it off in some location.  In the
second phase of source build (OfflineBuild=true) we won't use GenAPI and instead
will read the sources from this location.

Commit migrated from https://github.com/dotnet/corefx/commit/ecfb60b67d09b992f24af0625305299710bc128f

Merge branch 'master' into MoveToolsConfig

Commit migrated from https://github.com/dotnet/corefx/commit/693be82ccc0cac5c66aad0b37a9c3ac9263233ce

[master] Update dependencies from dotnet/coreclr (dotnet/corefx#38020)

* Update dependencies from https://github.com/dotnet/coreclr build 20190528.71

- Microsoft.NET.Sdk.IL - 3.0.0-preview6.19278.71
- Microsoft.NETCore.ILAsm - 3.0.0-preview6.19278.71
- Microsoft.NETCore.Runtime.CoreCLR - 3.0.0-preview6.19278.71

* Expose nullable attributes

* Fix several nullable warnings due to nullable attribute changes

* Adjust build for ProjectNtfs bits not being current

Commit migrated from https://github.com/dotnet/corefx/commit/a977a24310055828d789520377b555ffd5df2835

Add test to validate dotnet/corefx#37567. (dotnet/corefx#38030)

Commit migrated from https://github.com/dotnet/corefx/commit/8ab18539bf0591f0e726cd295c3e06d1434eec14

Add test to validate dotnet/corefx#36167 is fixed. (dotnet/corefx#38029)

Commit migrated from https://github.com/dotnet/corefx/commit/1e642d1107f05268545e59533a4fe77ea2cdf303

Add readonly modifiers to SequenceReader. (dotnet/corefx#37718)

* Add readonly modifiers to SequenceReader.

Clearly marking where we don't mutate faciliates passing stack allocated spans and allows composing additional helpers that also want to describe that they don't mutate.

* Address some feedback

* Cache length again

* Change to compare to < 0

* put back the private field stripped out by the tool

* Add dummy primitive for SequenceReader

Commit migrated from https://github.com/dotnet/corefx/commit/0bae12c1967eaee2f1b20421df768e70d73da69c

improve reliability of HttpListenerFactory by verifying that Connect works (dotnet/corefx#38009)

Commit migrated from https://github.com/dotnet/corefx/commit/c04be1ef5bf77f370ff7282a7bd6bf0342ea54b8

Re-generate System.Collections ref assembly against implementation (dotnet/corefx#38005)

Commit migrated from https://github.com/dotnet/corefx/commit/837efeb37d25146f73d22952d4bbf84c1b216bcd

Avoid .ToArray() in JsonSerializer .NET Standard implementation (dotnet/corefx#37976)

* PooledBufferWriter<T> is always used as byte buffer, make it PooledByteBufferWriter to be able to call stream.Write(bytes)

* avoid expensive .ToArray in .NET Standard implementation

* rename

Commit migrated from https://github.com/dotnet/corefx/commit/e3a4edabd12b5f7dc9be20136cc867bbe67f1f7c

Exclude xunit.core.dll

Commit migrated from https://github.com/dotnet/corefx/commit/f5cf3f1093fa49e2e40ca4d32f9eb79d8b5983ab

Merge branch 'MoveToolsConfig' of https://github.com/ViktorHofer/corefx into MoveToolsConfig

Commit migrated from https://github.com/dotnet/corefx/commit/6ff8890ea77087e7315436dd96306d6c2442877e

Remove SSL cancellation workaround from SocketsHttpHandler (dotnet/corefx#37990)

Both sockets cancellation and SslStream auth cancellation have been implemented.

Commit migrated from https://github.com/dotnet/corefx/commit/46800900077920534038be00d7bc73236e1a5fa7

Base64 encoding with simd-support (dotnet/corefx#34529)

* Optimized scalar code-path

* Fixed label names

* Implemented vectorized versions

* Added reference to source of algorithm

* Added back missing namespace

* Unsafe.Add instead of Unsafe.Subtract

Fixed build-failure (https://ci3.dot.net/job/dotnet_corefx/job/master/job/linux-musl-TGroup_netcoreapp+CGroup_Debug+AGroup_x64+TestOuter_false_prtest/8247/console)
Seems like the internal Unsafe doesn't have a Subtract method, so use Add instead.

* Added THIRD-PARTY-NOTICES

* PR Feedback

* THIRD-PARTY-NOTICES in repo-base instead instead in folder

Cf. https://github.com/dotnet/corefx/pull/34529#issuecomment-453510246

* PR Feedback

* https://github.com/dotnet/corefx/pull/34529#discussion_r247200659
* https://github.com/dotnet/corefx/pull/34529#discussion_r247214904

* Rewritten to use raw-pointers instead of GC-tracked refs

Cf. https://github.com/dotnet/corefx/pull/34529#discussion_r247197669

* Initialized the static fields directly (i.e. w/o cctor)

Cf. https://github.com/dotnet/corefx/pull/34529#discussion_r247193419

* Added a test for decoding a (encoded) Guid

The case with decoding encoded 16 bytes was not covered by tests, so a wrong code got commited before, resulting
in DestinationTooSmall instead of the correct Done.

* EncodingMap / DecodingMap as byref instead of pointer

So got rid of the `rep stosd` in the prolog. Cf. https://github.com/dotnet/corefx/pull/34529#discussion_r248075157

* PR Feedback

* https://github.com/dotnet/corefx/pull/34529#discussion_r262165689

* Debug.Fail instead throwing for the assertion

Cf. https://github.com/dotnet/corefx/pull/34529#discussion_r263894301

* ROSpan for static data

* ROS for lookup maps

* In decode avoided stack spill and hoisted zero-vector outside the loops

Cf. https://github.com/dotnet/corefx/pull/34529#discussion_r287613894

* Assert assumption about destLength

Cf. https://github.com/dotnet/corefx/pull/34529#discussion_r287605561

* Added comments from original source and some changes to variable names

Cf. https://github.com/dotnet/corefx/pull/34529#discussion_r287606634 and https://github.com/dotnet/corefx/pull/34529#discussion_r287606714

* Use TestZ instead of MoveMask in AVX2-path

Cf. https://github.com/dotnet/corefx/pull/34529#discussion_r287825385

* Fixed too complicated mask2F creation

Improved the version done in dotnet/corefx@c8b6cb3387ca856f52d246ad260172c8fe1d9dcd, so the static data isn't needed and code is more compact and readable.

Commit migrated from https://github.com/dotnet/corefx/commit/036e0a64bd190e80f1685c3b267e495b03bb2962

React to xunit runner changes in arcade

Commit migrated from https://github.com/dotnet/corefx/commit/78aa3760d304388f0e66d1d4e87c0f638fec0c7f

Move dotnet-tools config

Commit migrated from https://github.com/dotnet/corefx/commit/1e67bf524952958ac361fc525a6eebece16b15fa

Update ProjectNTfs to beta-27729-00

Commit migrated from https://github.com/dotnet/corefx/commit/5dc4a0875331970d9b7435f07f5c4eedf57d93a3

Disable sporadically failing GetGCMemoryInfo test (dotnet/corefx#37995)

Commit migrated from https://github.com/dotnet/corefx/commit/c7d48ca7732b7717e84d8375588d83866104ef58

Make AuthenticateAsClient/ServerAsync cancellation token optional (dotnet/corefx#37996)

Commit migrated from https://github.com/dotnet/corefx/commit/2f28708788d67eb9943cd14a39df4bc87298418e

Improve SocketAddress.ToString() performance (dotnet/corefx#37973)

* Improve SocketAddress.ToString() performance

* Disable test on Unix

Commit migrated from https://github.com/dotnet/corefx/commit/7508b75b843d89f6df5e5789c65a3cc23b94b757

Creating common security policy

Commit migrated from https://github.com/dotnet/corefx/commit/c0629b395e8cfe632fcf1bd75e9de1a02cbb514c

Remove socket cancellation workarounds on Unix from System.IO.Pipes (dotnet/corefx#37988)

Commit migrated from https://github.com/dotnet/corefx/commit/ac24849e0404b9a7caba56fd398dbe6c5dbede0a

Improve Debug.Assert in ConcurrentBag (dotnet/corefx#37986)

To try to help track down a spurious assert failure.

Commit migrated from https://github.com/dotnet/corefx/commit/3ca2657708840510873d8564c182ed06e92d87f6

Make JsonPropertyNameAttribute.Name readonly (dotnet/corefx#37829)

Rename ctor arg to name

Fixes: dotnet/corefx#37552

Commit migrated from https://github.com/dotnet/corefx/commit/e8990ae04e4ef62f5ccb143352472c9b4d5d5968

Add Skip and TrySkip APIs to Utf8JsonReader with tests. (dotnet/corefx#37793)

* Add Skip and TrySkip APIs to Utf8JsonReader with tests.

* Auto-generate the ref assembly.

* Remove new lines and update bytes consumed to avoid adjusting OS specific offsets.

* Add IsFinalBlock public property.

* Break up the skip/try skip method into helpers.

* Add more direct tests and update impl to avoid unnecessary struct copy.

Commit migrated from https://github.com/dotnet/corefx/commit/2f2aca43ef9d24c794255c3ef5d0238dc479652b

User-Agent header is ignored in "CONNECT" requests  (dotnet/corefx#37785)

* flow UserAgent on CONNECT

* Apply Stephen feedback

* address PR feedback

* update test

* fix style

Commit migrated from https://github.com/dotnet/corefx/commit/1064d0352c007fd2d8fb32d7f6e286fbb6d41264

[master] Update dependencies from dotnet/coreclr (dotnet/corefx#37953)

* Update dependencies from https://github.com/dotnet/coreclr build 20190524.71

- Microsoft.NET.Sdk.IL - 3.0.0-preview6.19274.71
- Microsoft.NETCore.ILAsm - 3.0.0-preview6.19274.71
- Microsoft.NETCore.Runtime.CoreCLR - 3.0.0-preview6.19274.71

* Fix Monitoring tests to reflect newly implemented support

* Fix StringBuilder tests to reflect updated unsupported braces behavior

* Update dependencies from https://github.com/dotnet/coreclr build 20190527.72

- Microsoft.NET.Sdk.IL - 3.0.0-preview6.19277.72
- Microsoft.NETCore.ILAsm - 3.0.0-preview6.19277.72
- Microsoft.NETCore.Runtime.CoreCLR - 3.0.0-preview6.19277.72

* Fix ordering of retrieving process time values in Monitoring test

Commit migrated from https://github.com/dotnet/corefx/commit/f90b73ebf00fbe3a4e97fa6445bb69a69985a800

Merge pull request dotnet/corefx#37975 from dotnet-maestro-bot/master-UpdateDependencies

Update ProjectNTfs to beta-27728-00 (master)

Commit migrated from https://github.com/dotnet/corefx/commit/8d1149c3c73cbb650014ccffe2136bad1287b216

Update ProjectNTfs to beta-27728-00

Commit migrated from https://github.com/dotnet/corefx/commit/6033b11330ec30e378b17dc636cb667d103090ac

Move dotnet-tools config

Commit migrated from https://github.com/dotnet/corefx/commit/248f09549518a3e83d1428a94a202ed3bc01fafb

Move tests with external servers to outerloop (dotnet/corefx#37934)

* move tests with external servers to outerloop

* fix Set_ValidValues_Success

Commit migrated from https://github.com/dotnet/corefx/commit/d58a8ade31b4731759c92df00d0f6398c52f3d83

Merge pull request dotnet/corefx#37950 from dotnet/darc-master-201ad320-f5b9-4f45-bcaa-3bd13b56ebcf

[master] Update dependencies from dotnet/arcade

Commit migrated from https://github.com/dotnet/corefx/commit/5dd3196b5af24be242019ac1c5eb9344dfd5e155

Update ProjectNTfs to beta-27727-00 (dotnet/corefx#37961)

Commit migrated from https://github.com/dotnet/corefx/commit/ba19505d72fdd39e9a4f5ca1be1fa2084f76bf0f

Remove custom restore for arcade

Commit migrated from https://github.com/dotnet/corefx/commit/c31734ad51d054919d27fe83847ad656e095b974

Update xml doc comment for JsonSerializerOptions.IgnoreReadOnlyProperties (dotnet/corefx#37910)

* Update xml doc comment for JsonSerializerOptions.IgnoreReadOnlyProperties

* 'Note:' -> '<remarks>'

* Update src/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.cs

Co-Authored-By: Carlos Sanchez Lopez <1175054+carlossanlop@users.noreply.github.com>
Commit migrated from https://github.com/dotnet/corefx/commit/a59cb1a773af5bf651f461546ac1d89a92519278

Use Thread instead of Task.Run in some Task tests (dotnet/corefx#37932)

Stephen Toub pointed that it is possible when using Task.Run, there could be some ThreadLocal fields on the thread executing the task holding a reference to the object we are trying to GC collect and finalize. The fix here is use Thread objects instead of Task.

Commit migrated from https://github.com/dotnet/corefx/commit/bf7dbd6d37285a147dd30f5dfca6582046dcabc7

Fix binary bitwise operators with resized BitArray (dotnet/corefx#37876)

* fix binary bitwise operators with resized bitarray
* Use `Length` property instead of array.Length to avoid operating on unused area
* Add tests for binary bitwise operators using resized bitarrays

* Revert micro-optimisations

Commit migrated from https://github.com/dotnet/corefx/commit/3232bbdf246257690cb2710609de6ff9aa3412ce

Re-generate System.Runtime.InteropServices ref source against implementation (dotnet/corefx#37914)

* Re-generate System.Runtime.InteropServices ref source against implementation

* PR Feedback

Commit migrated from https://github.com/dotnet/corefx/commit/564ced2a4cfcb02c1efc1e0da83c54f2b9073ea4

rename ToBytes to ToUtf8Bytes (dotnet/corefx#37912)

Commit migrated from https://github.com/dotnet/corefx/commit/4e342b94a06e21604cd805d0340ef871adc47c43

Update ProjectNTfs to beta-27724-00 (dotnet/corefx#37921)

Commit migrated from https://github.com/dotnet/corefx/commit/555d6e7991cec1f03b8782bd3fa4cfe5e7bcaa4d

fix dotnet/corefx#36798 by updating PipeReader doc comment (dotnet/corefx#37919)

Fixes dotnet/corefx#36798

Corrects an inaccurate doc comment in System.IO.Pipelines.PipeReader

Commit migrated from https://github.com/dotnet/corefx/commit/cbc9701436853421b389e118e410e7470c887353

Address dotnet/corefx#37794 by removing "UTF-16" when not needed in System.Text.Json docs (dotnet/corefx#37866)

* Remove UTF-16 notes from summary and param comments dotnet/corefx#37794

* Remove UTF-16 references from JsonEncodedText comments

* Address PR review comments by @ahsonkhan

Commit migrated from https://github.com/dotnet/corefx/commit/c539d6c627b169d45f0b4cf1826b560cd0862abe

Fix typo in JsonSerializer api documentation. (dotnet/corefx#37917)

Commit migrated from https://github.com/dotnet/corefx/commit/57337477528b0b3344c4f190ea0ad85d5bc19cd0

Support unlimited array dimensions (dotnet/corefx#37867)

Commit migrated from https://github.com/dotnet/corefx/commit/025bb33e27b15d973e8be430a9329309ecac37d3

Add nowarns for reference assemblies to be annotated with nullable warnings (dotnet/corefx#37901)

Commit migrated from https://github.com/dotnet/corefx/commit/41489a93acf3f36abcaaaea2003a8fdbb577cf35

Add logging at the Task timeout tests (dotnet/corefx#37874)

We need to get more info to understand what is going on when the test timeout. Also, we are now FailFast to have the test runs create a debugger dump at least when running on Linux platforms. Hopefully this can help in the diagnostics

Commit migrated from https://github.com/dotnet/corefx/commit/510ab9e6433ff0df29e0ae080140f4f2c1b69abd

Update ProjectNTfs to beta-27723-00 (dotnet/corefx#37887)

Commit migrated from https://github.com/dotnet/corefx/commit/97fb32cbd491a5614190ae476c41da3f49b0ab22

Update to new compiler toolset by using arcade's property (dotnet/corefx#37883)

* Update to new compiler toolset by using arcade's property

* Run manual darc update

Commit migrated from https://github.com/dotnet/corefx/commit/daa005b23d4954d4a41b1663171d6ada2d960bd2

Use RepoTools instead of global tools (dotnet/corefx#37858)

Commit migrated from https://github.com/dotnet/corefx/commit/58c30f7413b93f47d332c8ec50a40013c3694791

Remove LanguageTargets switch (dotnet/corefx#37875)

Commit migrated from https://github.com/dotnet/corefx/commit/9963d520d38caf5318356a08c4a3b08f904d2b26

Use netfx ref package from nuget (dotnet/corefx#37869)

Commit migrated from https://github.com/dotnet/corefx/commit/c8e1416eb6801c782e98bf6fff8e0110bde5011c

Fix threading issue when reading and writing from SslStream at the same time (dotnet/corefx#37736)

Commit migrated from https://github.com/dotnet/corefx/commit/a28444b71a45171c07eb28a5d82086a4589665fe

Update issue-guide.md

Adding Cory

Commit migrated from https://github.com/dotnet/corefx/commit/40197abf52c92572a3cdb2005d6250eae9b8a9f9

initial support for new network protocols (dotnet/corefx#37315)

* initial support for new network protocols

* feedback from review

* fix compilation of AF_CAN

Commit migrated from https://github.com/dotnet/corefx/commit/6f6790fa8219359f2acbe4b0624a3fa9a0a6943b

Update area owners for System.IO.Pipelines

Commit migrated from https://github.com/dotnet/corefx/commit/23d3b1b5bd5fc97f2d96a0c5a63fa14657607b63

Merge pull request dotnet/corefx#37851 from BruceForstall/PublishMoreCorefxTests

Publish corefx tests for more platforms

Commit migrated from https://github.com/dotnet/corefx/commit/7432f96e2af8541bcb2a22cd6a0bd625fe7f71a2

Update ProjectNTfs to beta-27722-00 (dotnet/corefx#37859)

Commit migrated from https://github.com/dotnet/corefx/commit/62951c47e6897c1c9f18a4b2aeee64d99968cb76

using netcoreapp2.1 version if colorUtil (dotnet/corefx#37854)

Commit migrated from https://github.com/dotnet/corefx/commit/ee35d4f56f8509267fe56086394966f2804d8557

Regression test for multiple attributes on the same type (dotnet/corefx#37518)

Contributes to dotnet/corefx#37261

Commit migrated from https://github.com/dotnet/corefx/commit/85d82a0402e26fb02be4c006752904cb8e0f8b02

Fix ambiguous Utf8JsonReader Get/TryGet method documentation (dotnet/corefx#37779)

Commit migrated from https://github.com/dotnet/corefx/commit/2016619a120bcf6c690801bc577b2e170f1a92e1

Update packageIndex.json with packages from release branches (dotnet/corefx#37600)

* Update packageIndex.json with packages from release branches

* Fixing last packaging validation errors

Commit migrated from https://github.com/dotnet/corefx/commit/8d0428194d69a8d7fb249a9f4ef780cb4cd54de4

Publish corefx tests for more platforms

Add publishing for Linux/arm64, Linux/arm32, musl/x64, musl/arm64.

Commit migrated from https://github.com/dotnet/corefx/commit/4c5a775daddc95fa484e36637bcb9a67edbbd575

Add Utc test to ensure creating only one instance (dotnet/corefx#37721)

* Add Utc test to ensure creating only one instance

* Address the feedback

Commit migrated from https://github.com/dotnet/corefx/commit/39c7df85afee9ddc8bc1a1726a92526d43b1959f

Exclude non netcoreapp packages from OOB package (dotnet/corefx#37845)

Commit migrated from https://github.com/dotnet/corefx/commit/008d21c47c22b5757e09f6c3d346998004a0f985

Avoid StackOverflowException when cyclic enumerable Type (dotnet/corefx#37818)

Commit migrated from https://github.com/dotnet/corefx/commit/857d1d1a9e1cd3597e3b1488f119d3a52e8b921a

Update ProjectNTfs to beta-27721-00 (dotnet/corefx#37832)

Commit migrated from https://github.com/dotnet/corefx/commit/a70f241c0096ed2695333faaa08811e09e947a80

Adding some additional tests to validating formatting is correct with regards to rounding. (dotnet/corefx#37820)

Commit migrated from https://github.com/dotnet/corefx/commit/b3ac650a36e2fa04988fb37c4a0a3195a9e2dc36

As Span and As Memory apis added for immutable arrays (dotnet/corefx#37757)

* As Span and As memory added for immutable arrays

* Fixing netstandard build

* using a more generic compile constant

* fixing build for netcoreapp

* building fix for netfx and netstandard

* fixing netstandard1.0, using generateRefereceASource to get ref file, tests for string and default immutable arrays

Commit migrated from https://github.com/dotnet/corefx/commit/51a1f16ee2aaded4ce1fca6847471b58f7ffa160

Reenable ModifyStore tests (dotnet/corefx#37827)

Commit migrated from https://github.com/dotnet/corefx/commit/11eba7947e9736109c588a1cfcb77987cb80f570

Implement GetComment API (dotnet/corefx#35705)

* CoreFx dotnet/corefx#33347: Implement GetComment API

* Generate References as per correct steps

* Exclude delims & line separators, new unescape test

* Revert consume comment changes, test case fixes

* Partial revert of previous incorrect online merge

* fixed another online merge conflict resolution slippage

* Intermediate rebase from master

* Reworked files

* Reworked files 2

* Fix coding sytle as per review comments

Commit migrated from https://github.com/dotnet/corefx/commit/53aaaf3c848e4e737420de2b46f7cace397d730a

Add Microsoft.Private.CoreFx.OOB package (dotnet/corefx#37784)

* Add Microsoft.Private.CoreFx.OOB package

Commit migrated from https://github.com/dotnet/corefx/commit/ef1a5aa730098b6c3350977a991232c1ff11cfe3

[master] Update dependencies from dotnet/coreclr (dotnet/corefx#37746)

* Update dependencies from https://github.com/dotnet/coreclr build 20190516.72

- Microsoft.NET.Sdk.IL - 3.0.0-preview6-27716-72
- Microsoft.NETCore.ILAsm - 3.0.0-preview6-27716-72
- Microsoft.NETCore.Runtime.CoreCLR - 3.0.0-preview6-27716-72

* Update dependencies from https://github.com/dotnet/coreclr build 20190517.72

- Microsoft.NET.Sdk.IL - 3.0.0-preview6-27717-72
- Microsoft.NETCore.ILAsm - 3.0.0-preview6-27717-72
- Microsoft.NETCore.Runtime.CoreCLR - 3.0.0-preview6-27717-72

* Update dependencies from https://github.com/dotnet/coreclr build 20190518.72

- Microsoft.NET.Sdk.IL - 3.0.0-preview6-27718-72
- Microsoft.NETCore.ILAsm - 3.0.0-preview6-27718-72
- Microsoft.NETCore.Runtime.CoreCLR - 3.0.0-preview6-27718-72

* Update dependencies from https://github.com/dotnet/coreclr build 20190519.72

- Microsoft.NET.Sdk.IL - 3.0.0-preview6-27719-72
- Microsoft.NETCore.ILAsm - 3.0.0-preview6-27719-72
- Microsoft.NETCore.Runtime.CoreCLR - 3.0.0-preview6-27719-72

* Fix ref assemblies due to change in coreclr

* Fix serialization tests after TimeZone change

Commit migrated from https://github.com/dotnet/corefx/commit/c85411a30c2c3a1d6ad3beea7be92b19b1e24df9

Converting SystemColors into InstanceDescriptors using Color Convertor (dotnet/corefx#37810)

* fixed converting systemcolors into instance Descriptor using colorConvertor

* doing a color check first

* checking if right property is returned

Commit migrated from https://github.com/dotnet/corefx/commit/f403c576995dd5860af48226d3ffaec873094ca9

Update supported architectures on Windows in docs

Commit migrated from https://github.com/dotnet/corefx/commit/e94ff8a041014decb591ecff475792d68603ca70

Update docs with Outerloop changes

Commit migrated from https://github.com/dotnet/corefx/commit/5f61457d4f8ab9daff042c168c34fced70f2fda2

Generate System.Runtime.Extensions reference assembly against implementation (dotnet/corefx#37811)

Commit migrated from https://github.com/dotnet/corefx/commit/2e1d93ea69e703345d4f8396aba5a9e47c965dea

Ensure JsonException is thrown parsing invalid DateTime, DateTimeOffset, and Guid dotnet/corefx#37807 (dotnet/corefx#37809)

* Add tests to cover dotnet/corefx#36901 and dotnet/corefx#37807

* Ensure DateTime(Offset) and Guid throw JsonException dotnet/corefx#37807

- The original JsonValueConverterXXX code for these allowed an InvalidOperationException
to be raised from Utf8JsonReader.TryGetXXX, instead of returning false so a JsonException
could be thrown.

Commit migrated from https://github.com/dotnet/corefx/commit/3ff5c4a6eb6315c61cfb0078245c31b59f798290

Update ProjectNTfs to beta-27720-00 (dotnet/corefx#37792)

Commit migrated from https://github.com/dotnet/corefx/commit/7373fd9794c4b52c2a4d253cc2bc4b47c2054241

Fix testscope usage in yml and sh script (dotnet/corefx#37805)

Commit migrated from https://github.com/dotnet/corefx/commit/889491763322134a1a184f3d54eb1f3605949d33

Add string-based WriteAsProperty overload to JsonElement. (dotnet/corefx#37789)

* Add string-based WriteAsProperty overload to JsonElement.

* Address PR feedback - remove UTF-16 from the comments.

Commit migrated from https://github.com/dotnet/corefx/commit/189766719a059512a515d488efc5c65c7abf0650

SkipValidation when using the writer internally within the serializer. (dotnet/corefx#37791)

Commit migrated from https://github.com/dotnet/corefx/commit/e58b35cd0f8fe6caa194ca7e48388d8d59854fe0

[System.Drawing] Fix cut & paste error (dotnet/corefx#37788)

Commit migrated from https://github.com/dotnet/corefx/commit/8261325d82e18ce559dd19cde7e40c2ab140ed8b

Throw ArgumentException in JsonSerializer if ReadCommentHandling is Allow dotnet/corefx#37634 (dotnet/corefx#37713)

* Add tests for Allow failing in JsonSerializer Parse/Read dotnet/corefx#37634

* Add check to throw on ReadComentHandling == Allow dotnet/corefx#37634

* Remove unused parameter from CheckSupportedOptions

* Move Allow check into JsonSerializerOptions

Commit migrated from https://github.com/dotnet/corefx/commit/27dae83598c87e3cf4b139c8c981c13fe8e9a81e

Added value type serialization support (dotnet/corefx#36506)

* Added value type serialization support

* Fixed coding style issue

Commit migrated from https://github.com/dotnet/corefx/commit/d70ba24c8ca8d8a4384ebe732b3cd748a22e9551

Allow run Outerloop tests only (dotnet/corefx#37766)

* Allow run Outerloop tests only

* Rename to testScope

* Manual darc update from build '20190517.7'

Commit migrated from https://github.com/dotnet/corefx/commit/963480a7a8f8cf59e3be8f9bfe6ba87623d04088

Remove aliases (dotnet/corefx#37759)

Commit migrated from https://github.com/dotnet/corefx/commit/c671ce2be16ae3c6086a061d9d94b81005217735

Consume comments changes (dotnet/corefx#35934)

* Consume comments changes

* Fixed issues in branch splitting

* Use sequence positions. Elaborate comments.

* Reworked algos, review comment fixes

* Fixed review comments

* minor comment fix

* Standardize exception messages

* Clean up exception messages

Commit migrated from https://github.com/dotnet/corefx/commit/d72d7203a89d3207985c9aca6f02fb8576cbe47b

Generate System.Runtime ref assembly against implementation (dotnet/corefx#37737)

* Generate System.Runtime ref assembly against implementation

* PR Feedback and baseline uapaot errors

Commit migrated from https://github.com/dotnet/corefx/commit/959168e7ff3f9f1957e9e45206ed42d4231d1312

Add resource containers missing in Outerloop.yml (dotnet/corefx#37761)

Commit migrated from https://github.com/dotnet/corefx/commit/b578d19c256d9a95111e2fd81e72f06c077b766c

Unit tests for Path.Join overloads (dotnet/corefx#37285)

* Unit tests for Path.Join overloads

* Add more unit tests

* Minor mod to JoinStringArray_8 test

* Add unit test for zero-length array

* Use proper const for zero-len string

* Added unit test for array of one element

* Format fix: missing/extra space

Commit migrated from https://github.com/dotnet/corefx/commit/a4da51f02f194bdedc9320a50aa63b72411488b6