Merge pull request dotnet/coreclr#7340 from russellhadley/MoveCSEtoBitVec

Add code to switch to BitVec data structure in CSE optimization.

Commit migrated from https://github.com/dotnet/coreclr/commit/978e26bfe641eb7d8c3f34b8526020cf97d05c9a

Merge pull request dotnet/coreclr#1965 from lasombra/patch-1

Update linux-instructions.md

Commit migrated from https://github.com/dotnet/coreclr/commit/09f38a8a4b8314a4e3e4c9fde2754d8152496684

Merge pull request dotnet/coreclr#7640 from dotnet-bot/master-UpdateDependencies

Update CoreClr, External to beta-24616-02, beta-24616-00, respectively (master)

Commit migrated from https://github.com/dotnet/coreclr/commit/4677f2e231ae8c504c9626e2d03e927f27a44173

Update linux-instructions.md

Commit migrated from https://github.com/dotnet/coreclr/commit/aabd80225781517a8a0696a35772b160e9cc0732

Update linux-instructions.md

Commit migrated from https://github.com/dotnet/coreclr/commit/2b92691f2dafb88ac94b3a5aa12849717f774baa

Update linux-instructions.md

Commit migrated from https://github.com/dotnet/coreclr/commit/860f3a0c4aa5822d250ad015dff23e03de072822

Update linux-instructions.md

Commit migrated from https://github.com/dotnet/coreclr/commit/fb852718a89ef67704f12a61cbb91deb37b96a52

Update CoreClr, External to beta-24616-02, beta-24616-00, respectively

Commit migrated from https://github.com/dotnet/coreclr/commit/01acd94e9ff84a2fee8924b5d52a73956fc6ddb6

Merge pull request dotnet/coreclr#7630 from dotnet-bot/master-UpdateDependencies

Update CoreClr, CoreFx to beta-24616-01, beta-24615-03, respectively (master)

Commit migrated from https://github.com/dotnet/coreclr/commit/78c7b15569866b66b2ef73075ad2bd284eab961e

Merge pull request dotnet/coreclr#7632 from dotnet/revert-7213-revert-7123-WinArm32CI

Re-Enable Win32Arm CI support

Commit migrated from https://github.com/dotnet/coreclr/commit/880e78ed06eb4c67c215c8bec520e9b3ca29febe

Update CoreClr, CoreFx to beta-24616-01, beta-24615-03, respectively

Commit migrated from https://github.com/dotnet/coreclr/commit/a657622b975b96d6f49364efb336e0a48ba128fc

Merge pull request dotnet/coreclr#7637 from gkhanna79/FixArm32Build

Few more fixes for WinArm32 CI build.

Commit migrated from https://github.com/dotnet/coreclr/commit/dd22bb118725b346b98d7f96cbf8583649fc2dba

Few more fixes for WinArm32 CI build.

Commit migrated from https://github.com/dotnet/coreclr/commit/fcbedc50021fb4aa8752c91c7605ab4f4f0b5989

String.SplitInternal: Remove unnecessary stackalloc (dotnet/coreclr#7623)

Simply take the address of the `char` instead of stackallocating a
`char[1]`.

Commit migrated from https://github.com/dotnet/coreclr/commit/830b3977f28daad665a26d4e5b127af1a48e6596

Merge pull request dotnet/coreclr#7633 from ramarag/master

Exposing Gc.TryStartNoGCRegion

Commit migrated from https://github.com/dotnet/coreclr/commit/e90d6ef97f5d65fcfc82955db02c0ccfbb36bdd4

Merge pull request dotnet/coreclr#7631 from ramarag/Activator

Throwing PlatformNotSupportedException for ActivationAttributes

Commit migrated from https://github.com/dotnet/coreclr/commit/1f9a08d4647a3367858f790f4e1c33eb745ca41a

Revert "Revert "Enable Win32Arm CI support""

Commit migrated from https://github.com/dotnet/coreclr/commit/1249aa63a1ec31a6f1c1f4b201cad16d77f9c74c

Merge pull request dotnet/coreclr#7629 from gkhanna79/FixArmSdkDetection

Explicitly specify the Windows SDK version for CMake.

Commit migrated from https://github.com/dotnet/coreclr/commit/7a02a9341b0681660ca7f394a980b4b888800f8b

Exposing Gc.TryStartNoGCRegion

Commit migrated from https://github.com/dotnet/coreclr/commit/a291019569e0a9771a49f7fe5b632f061853452c

Merge pull request dotnet/coreclr#7622 from gkhanna79/SimplifyExtVer

Simplify External Package Versioning.

Commit migrated from https://github.com/dotnet/coreclr/commit/1e69ba0a572baed68484e2d15580340601304d60

Throwing PlatformNotSupportedException for ActivationAttributes

Commit migrated from https://github.com/dotnet/coreclr/commit/997fd848c53d75890a7072ab3f55b4eb6c2e244f

Allows not to build LLDBPLUGIN (dotnet/coreclr#7390)

Commit migrated from https://github.com/dotnet/coreclr/commit/ae2c112b644293f24107b5ed133a65d4a7dd2c5f

Explicitly specify the Windows SDK version for CMake.

Commit migrated from https://github.com/dotnet/coreclr/commit/cb608b92605772afea32831c9b8186ab0f2203af

Merge pull request dotnet/coreclr#7627 from dotnet-bot/from-tfs

Merge changes from TFS

Commit migrated from https://github.com/dotnet/coreclr/commit/8bb25719e1c03adac47ad7d3c2bb03b43e9ca0dc

Add code to switch to bitvec datastructure in cse optimization.

This change will allow us to track more than 64 cse candidates.
Initally the data structure is set to the same limits (64) as is
currently used.  This gives us a no diffs.  Subsequent changes
will change these limits based on opportunities found in the benchmarks.

Commit migrated from https://github.com/dotnet/coreclr/commit/213468245fd42ec6829635c6f300f1aef972e26a

Fix build breaks

[tfs-changeset: 1633395]

Commit migrated from https://github.com/dotnet/coreclr/commit/706f5116f6b3a62460fd0ff9817c1b63c036197e

NullReferenceException APIs (dotnet/coreclr#7338)

* add typeID APIs
* add variable home API

Commit migrated from https://github.com/dotnet/coreclr/commit/37606601b6293e9c46f4d7cc614b9304fed7647b

Merge pull request dotnet/coreclr#7591 from vancem/ActivitiesForListeners.10-13-16

TFS Bug 274079: Activity Tracking does not work with EventListeners

Commit migrated from https://github.com/dotnet/coreclr/commit/e1a43763a1aa8e08d023cfc9d4f1e9bb88553793

Update the header string in runtest.sh (dotnet/coreclr#5785)

Replace 'bc' with the bash expr.
Add the countTotalTests numbers to headers depends on verbose option.

Fix dotnet/coreclr#5677

Signed-off-by: Jiyoung Yun <jy910.yun@samsung.com>
Commit migrated from https://github.com/dotnet/coreclr/commit/6611f1222a7b45d0110e988f16fae5da50b3248a

Add RunBenchmarks.sh for unix-like systems (dotnet/coreclr#6471)

Usage is basically the same as RunBenchmarks.cmd.

Commit migrated from https://github.com/dotnet/coreclr/commit/9b7f01a15eba1122516d4c566bc60c3c57cbaa22

Merge pull request dotnet/coreclr#4056 from svick/threadpoolglobals-readonly

Make fields in ThreadPool readonly/const where possible

Commit migrated from https://github.com/dotnet/coreclr/commit/c944e13d66ddc09bc1f7f35e252a9f0837601348

Enable RegionInfo netstandard 1.7 APIs (dotnet/coreclr#7604)

* Enable RegionInfo netstandard 1.7 APIs

* Fix the typo

* lowercase TRUE and FALSE

Commit migrated from https://github.com/dotnet/coreclr/commit/c449879e7a1ec2556bcb157e86e25a8517e9bacb

Merge pull request dotnet/coreclr#7580 from benaadams/flag-doesnot-return-early

Flag does_not_return early

Commit migrated from https://github.com/dotnet/coreclr/commit/ff3ab00d20dcf514e33c547c2c7142a626917833

Merge pull request dotnet/coreclr#7620 from dotnet-bot/master-UpdateDependencies

Update CoreClr to beta-24614-03 (master)

Commit migrated from https://github.com/dotnet/coreclr/commit/75111e6c704ff93eda8852b6a9fa3332e69c44f4

Fix stable version for external dependency

Commit migrated from https://github.com/dotnet/coreclr/commit/ac192d0abbd5bd11e84e731e34b23503f8985962

Simplify External Dependency versioning

Commit migrated from https://github.com/dotnet/coreclr/commit/2c5c3ba4454cf286b22c9795252b9863a091faa4

Change warning to error for test asset framework issues. (dotnet/coreclr#6535)

Commit migrated from https://github.com/dotnet/coreclr/commit/0f89bd29d3f77a1a6f5a4764d0747270fc89e4a5

Update CoreClr to beta-24614-03

Commit migrated from https://github.com/dotnet/coreclr/commit/e45ff803b982675ed84b31713f2251287367b61b

Remove DEBUGGING_SUPPORT #ifdef (dotnet/coreclr#7611)

This is always on. It hadn't been turned off in a long, long
time, if ever, and we don't expect to ever turn it off.

Commit migrated from https://github.com/dotnet/coreclr/commit/13fd17f72c5c311d8a4a685310d14b536d568bcd

Update CoreClr, CoreFx, External to beta-24614-02, beta-24614-01, beta-24614-00, respectively (dotnet/coreclr#7615)

Commit migrated from https://github.com/dotnet/coreclr/commit/f8c3968a769c8a847fd122cba6c08bada33c3552

Merge pull request dotnet/coreclr#7616 from dotnet-bot/from-tfs

Merge changes from TFS

Commit migrated from https://github.com/dotnet/coreclr/commit/ff76c81244d6089f364eb1813cf830e9bd7d9652

SpinLock.TryEnter fail fast for timeout 0 (dotnet/coreclr#6952)

* SpinLock.TryEnter fail fast for timeout 0 (2)

* Don't over check SpinLock timeout

When 1ms unlikely to have passed

Commit migrated from https://github.com/dotnet/coreclr/commit/0855b70b2542de60592cba7fe1c91bedb55566f4

Clarify code with unobvious precedence (dotnet/coreclr#1624)

Commit migrated from https://github.com/dotnet/coreclr/commit/24131889e148c5c4aa326429d904743160c973be

I had unintentionally excluded RuntimeThread.cs when FeatureCoreClr is false. Since parts of Thread.cs were refactored into RuntimeThread, including RuntimeThread.cs always.

[tfs-changeset: 1633304]

Commit migrated from https://github.com/dotnet/coreclr/commit/46e5ca1e080b7c09052665b9c23437b2c58cc78d

Merge pull request dotnet/coreclr#7605 from sandreenko/core_rt_1982

Lower helper call inside PInvoke

Commit migrated from https://github.com/dotnet/coreclr/commit/8ae6134fcec8fb50ccd0de07c2d167024fca570d

Merge pull request dotnet/coreclr#7603 from pgavlin/FixInteropTest

Fix a calling convention in SimpleStructNative.

Commit migrated from https://github.com/dotnet/coreclr/commit/23bbcded42863b8fdac3f1018c698cd21803db44

Enable DoStackSnapshot API on ARM to walk the current thread (dotnet/coreclr#6933)

Commit migrated from https://github.com/dotnet/coreclr/commit/c0a8c47df1cec6ee6060e36392b6ea30bd042eac

Lower helper call inside PInvoke

Lowering can create a helper call. The helper call is inserted to the
part of the block, that was lowered. So the helper call should be
lowered independently.

Commit migrated from https://github.com/dotnet/coreclr/commit/2c8352e34bde086d24cdade273b361c988f3d15c

Merge pull request dotnet/coreclr#2192 from dasMulli/random-seeding-improvements

System.Random: Parameterless constructor seeding improvement dotnet/coreclr#1919

Commit migrated from https://github.com/dotnet/coreclr/commit/19ad9ddb519084a75b48fe56bba24e67500e7ca3

Merge pull request dotnet/coreclr#7602 from smile21prc/coreclr-perf

Make coreclr Windows perf run versionless on benchview binaries

Commit migrated from https://github.com/dotnet/coreclr/commit/0a196017d8fbd76bc4a36c6452f3af7c3bb339d9

Added Docs for Using Visual Studio to Edit and Debug in CoreCLR Repo (dotnet/coreclr#7582)

Commit migrated from https://github.com/dotnet/coreclr/commit/b73eb6032205bd0603e0bdcf5b4305997ed00e08

Merge pull request dotnet/coreclr#7600 from jkotas/master-UpdateDependencies

Update CoreClr, CoreFx to beta-24612-03, beta-24612-04, respectively

Commit migrated from https://github.com/dotnet/coreclr/commit/d82177eedb868353ab3a42c1cf503bcc28ed741b

Merge pull request dotnet/coreclr#7593 from pgavlin/DisableGCStressTest

Disable a test that is not compatible with GC stress.

Commit migrated from https://github.com/dotnet/coreclr/commit/0e329a76c977dd4c5d5318da1a81b00e77999a96

Fix a calling convention in SimpleStructNative.

The managed code expects `GetFptr` to have the `stdcall` calling
convention. Because of the mismatch, the JIT-generated code was not
cleaning up the stack after P/Invoking to this function on x86, which
was causing a failure during GC stress.

Commit migrated from https://github.com/dotnet/coreclr/commit/d84d2e4921cea1895b5ecb750604ca29d86eec4b

Make coreclr Windows perf run versionless on benchview so they won't be broken by benchview updates.

Commit migrated from https://github.com/dotnet/coreclr/commit/fc7080a2a45cb052c78e0f1a299612b657ee006f

Update tests to netcoreapp1.1

Commit migrated from https://github.com/dotnet/coreclr/commit/1cbddb3274075c31b71c9a770464b744fc3751b5

Disable a test that is not compatible with GC stress.

This test fails under GCStress=0xC for all of RyuJIT/x86, legacy backend
x86, and JIT32.

Commit migrated from https://github.com/dotnet/coreclr/commit/7535cba9d3a19569bb14b431e27a084a15f68e63

Addressed PR feedback.

Commit migrated from https://github.com/dotnet/coreclr/commit/d6aadf7ade76b443c74e677ef5030c91b563ceab

Move up DOES_NOT_RETURN more

Commit migrated from https://github.com/dotnet/coreclr/commit/29d7af4f35d0b1dffe9c0ce144f8fb4f3e738136

Common List+Array Exceptions

Commit migrated from https://github.com/dotnet/coreclr/commit/2965a505cc02db0031d6adcc145fafce23e17479

Common CopyTo Exceptions

Commit migrated from https://github.com/dotnet/coreclr/commit/55047838b8bf0fc274992cff8b1f5088e867472b

Common Enumerator exceptions

Commit migrated from https://github.com/dotnet/coreclr/commit/b9fb8dc6d4b52788268a9d35bcb48b3b2726e6d5

Use existing common exceptions

Commit migrated from https://github.com/dotnet/coreclr/commit/f83e718eff9e984aeb4974fbb5abf67629fa3e94

Make ThrowHelper paths simple for DOES_NOT_RETURN

Commit migrated from https://github.com/dotnet/coreclr/commit/8e7d7908dd9ba340fc7c9628c5baa3098ab11f3e

Set DOES_NOT_RETURN flag in fgFindJumpTargets

Commit migrated from https://github.com/dotnet/coreclr/commit/d5796e90bbdcecc2389f0137217792155f0e908c

Count BBJ_RETURN in fgMakeBasicBlocks

Commit migrated from https://github.com/dotnet/coreclr/commit/fef8b0b2846f14a99d6394324de695fda9185e32

Merge pull request dotnet/coreclr#7510 from kouvel/ApiThread

Expose some members of the Thread class

Commit migrated from https://github.com/dotnet/coreclr/commit/1e37d9f35f757d77345fb75929f0472e9bb54c30

Merge pull request dotnet/coreclr#7595 from dotnet-bot/from-tfs

Merge changes from TFS

Commit migrated from https://github.com/dotnet/coreclr/commit/38ca345e46ba920a1df8ee1493435284ea9e5cab

Merge pull request dotnet/coreclr#7584 from sivarv/regressionTest

Adding JIT regression test for the re-morph optimzation that transforms JIT_Stelem_Ref(a, null, i)  into a[i]=null.

Commit migrated from https://github.com/dotnet/coreclr/commit/5e8d8ce69ef23e575dc95e538f9de580eae20fdb

Merge pull request dotnet/coreclr#7590 from smile21prc/coreclr-perf

Permanently fix benchview package version, and add code to produce perf-*-summary.xml on Linux

Commit migrated from https://github.com/dotnet/coreclr/commit/fddf3fd566e4b1f30da87e9bc6cab2af3c017977

Merge pull request dotnet/coreclr#7563 from wateret/fix-7398

[ARM/Linux] Fix HFA unit test regression

Commit migrated from https://github.com/dotnet/coreclr/commit/104be3dc7c514f5fea3b08576cd59615335f6bf3

Cleanup files excluded from CoreCLR build

[tfs-changeset: 1633047]

Commit migrated from https://github.com/dotnet/coreclr/commit/4cde2c8fad432da239f6db76158ea951ac72b856

Address feedback

Commit migrated from https://github.com/dotnet/coreclr/commit/11cb44d09a28b9c953007ac1e9fca2eef588f0a5

Merge pull request dotnet/coreclr#7585 from CarolEidt/Fix5699

x86: adjust stack level at throw blocks

Commit migrated from https://github.com/dotnet/coreclr/commit/0723a3ee582c77b531608635ec3652eb7d45dd3d

x86: adjust stack level at throw blocks

When we don't have a frame pointer, we need to adjust the frame pointer before calling the throw helper.
I initially had some concern that we had some exposure from instruction reordering in the backend, but we don't do any reordering of the `GT_PUTARG_STK` nodes. I have added a note to sideeffects.h to call attention to the fact that we need to consider stack depth changes to be side effects, for future consideration should we start doing more general code motion.
For the more general issue, I have extracted the code from codegenlegacy.cpp that does the stack adjustment, and am now unconditionally calling it from both codegenlegacy.cpp and codegenxarch.cpp.

Fix dotnet/coreclr#5699

Commit migrated from https://github.com/dotnet/coreclr/commit/2f3df7853d168c24113cea156f6870004e2d7103

Return false from IsMarshalByRefImpl/IsContextfulImpl when remoting is not supported (dotnet/coreclr#7583)

Remove references to types have been moved to corefx in the build
Consolidate FEATURE_CORECLR ifdefs

Commit migrated from https://github.com/dotnet/coreclr/commit/41f083792c77da3ba3b83ce7e5580e9c3287a3ef

Fail fast on a couple flaky tests to get crash dumps (dotnet/coreclr#7588)

Commit migrated from https://github.com/dotnet/coreclr/commit/983e6cf9f3d06c9a5120ed2aeb382742948382ab

Fix a tailcall test that fails with Ready-to-Run (dotnet/coreclr#7586)

The test case JIT/opt/Tailcall/TailcallVerifyWithPrefix has some methods that
depend on the JIT compiler doing automatic tail call. Since tail is not
supported with Ready-to-Run, the test case is modified to exclude such methods
from Ready-to-Run images.

Commit migrated from https://github.com/dotnet/coreclr/commit/9bbf9e2a46e2b84ba3a87a202a3ea94d8ef58f05

Port NullStream.CopyTo override from corert (dotnet/coreclr#7589)

Commit migrated from https://github.com/dotnet/coreclr/commit/55febd09fdff92abc3e8989faf3135f71251e91f

Update CoreClr, CoreFx to beta-24612-03, beta-24612-04, respectively

Commit migrated from https://github.com/dotnet/coreclr/commit/598388d849d28e5d5fd2dd87a96005d07455ebb0

Merge pull request dotnet/coreclr#7557 from sandreenko/long_decomp_6925

Use the existing operands for long decomposition dotnet/coreclr#6925

Commit migrated from https://github.com/dotnet/coreclr/commit/abcb7d9d00407e3dbedb4fe5b288e7972bdc3fb5

TFS Bug 274079: Activity Tracking does not work with EventListeners

Basically the automatic creation of activity IDs on start events and the flow of these IDs happened to only be enabled
when ETW subscribes to the events.

This change allows it also to work when EventListener's subscribe.

Commit migrated from https://github.com/dotnet/coreclr/commit/5fc11d62a9cc76128776da7b5c5d31d96e6f2903

Run VS formatting (no semantic change) (dotnet/coreclr#7587)

Commit migrated from https://github.com/dotnet/coreclr/commit/b6ef8e8c1f0749428085af8dba2aa2a0593a0d3d

Debugging

Commit migrated from https://github.com/dotnet/coreclr/commit/35cbe48b353439fa973eca041456b5d377891255

Move StreamHelpers from corefx and refactor Stream and MemoryStream to use it (dotnet/coreclr#7579)

Commit migrated from https://github.com/dotnet/coreclr/commit/1a767f2414b3adfede8f3de16114f39385910bec

Expose members of Thread that hide base class members

Commit migrated from https://github.com/dotnet/coreclr/commit/603e0afd3764dd240d6fcb1332e922a05842cccb

Fix build issue

Commit migrated from https://github.com/dotnet/coreclr/commit/fbc2311dff2c2c32133ea47ec84e96fadf7ac2bb

Fix build issue

Commit migrated from https://github.com/dotnet/coreclr/commit/1a06d3e84b11642e79804398e5cac90a2c66c583

Address feedback

Commit migrated from https://github.com/dotnet/coreclr/commit/9eb0637b10660798779655eda378f9acb2c5c62e

Expose some members of the Thread class

- Added RuntimeThread class that Thread derives from. An instance of RuntimeThread will be used by the Thread class in CoreFX to forward thread functionality to the runtime.
- Some functionality in the RuntimeThread could potentially be moved to CoreFX. In particular, some of thread creation and apartment state handling could probably be moved with some minimal help from the runtime. Leaving that refactoring for later.
- A few things are left unimplemented (for instance, apartment state handling doesn't work currently). That functionality will be enabled in a future change.

Part of dotnet/corefxdotnet/coreclr#11632, dotnet/corefxdotnet/coreclr#11638, dotnet/corefxdotnet/coreclr#11635

Commit migrated from https://github.com/dotnet/coreclr/commit/007d910f7e97c277bcc0681298384bb79ed32d81

Unnecessary temp loc vars were deleted in DecomposeLong.

Delete temp local variables from DecomposeNeg, DecomposeShift.
Remain local variables have several uses(DecomposeShift) or are call
arguments. Such variables can't be deleted.

Commit migrated from https://github.com/dotnet/coreclr/commit/47c312fd0d39aa960ee38d6948df4b9e920d83b8

Adding JIT regression test for a re-morph optimization.

Commit migrated from https://github.com/dotnet/coreclr/commit/6a4a93690898f2da67c9a000d509369f0ce6a1de

Provide KeyValuePair.Create static factory method (dotnet/coreclr#5755)

Just like Tuple.Create cuts down the noise and annoyance
of having to specify all the Ts when you already have typed
values to provide, a similarly designed KeyValuePair.Create
factory method would make code that creates those pairs
(i.e. public APIs that expose IEnumerable{KeyValuePair}
significantly more concise and readable.

Fixes dotnet/corefxdotnet/coreclr#2127

Commit migrated from https://github.com/dotnet/coreclr/commit/af076482b26baf02f291416e606ad6becbf8d28b

Merge pull request dotnet/coreclr#7576 from sandreenko/check_ready_to_run_for_protojit

set ready to run flag for protojit

Commit migrated from https://github.com/dotnet/coreclr/commit/618faa2c428ea432d478dbfec340929e502bb7f7

Exposing MarshalByRefObject (dotnet/coreclr#7558)

Commit migrated from https://github.com/dotnet/coreclr/commit/3cdb42e9b5a8ca871b53a27194106707a2db8962

Merge pull request dotnet/coreclr#7575 from sivarv/lsraStat

Dump LSRA stats.

Commit migrated from https://github.com/dotnet/coreclr/commit/2e1db20f4ea6d2859c148d24b81e4500a175a98f

Enable TextInfo APIs for netstandard 1.7 on Linux (dotnet/coreclr#7568)

* Enable TextInfo APIs for netstandard 1.7 on Linux

The change here is to enable the newly added netstandard 1.7 TextInfo APIs on Linux.

- moved the locale specific data to its own file Locale.Unic.cs
- added needed data to handle the TextInfo properties (e.g. codepages)
- created some helper methods in LocaleData classto handle accessing the locale data
- added the implementation for added APIs

* Fix some typos

Commit migrated from https://github.com/dotnet/coreclr/commit/adc6c44c252315200533c3d4dd71cefd261d612c

Merge pull request dotnet/coreclr#7561 from BruceForstall/Fix7483

Fix assertion regarding byteable reg when ngen'ing desktop mscorlib

Commit migrated from https://github.com/dotnet/coreclr/commit/a351d0ced8aaaa6ef18f526efde5b6e90e7c6555

Fix assertion regarding byteable xor reg,reg when ngen'ing desktop mscorlib

Fixes dotnet/coreclr#7483

The issue is that TreeNodeInfoInitCmp() will, under certain circumstances,
perform a tree transformation of a child node into a TYP_UBYTE type. Since
the TreeNodeInfo walk is bottom-up, its children have already been processed,
and they don't get the "byteable" register processing that is as the end of
TreeNodeInfoInit().

I extracted that processing into a TreeNodeInfoInitCheckByteable() function that
can be called after the TreeNodeInfoInitCmp() transformation.

A better solution might be to extract this, and other, tree transformations into
the prior "lowering" pass, such that TreeNodeInfoInit() and friends will only
do register requirement annotation. But that would be considerably more complicated,
so I opted not to do that for now.

I also fixed up a bunch of comments.

Commit migrated from https://github.com/dotnet/coreclr/commit/c30b1a022d8ce297900120998ec655b748d72cce

Fix conflicting identity of System.IO.TextReader (dotnet/coreclr#7578)

System.IO build was switched to use CoreFX copy of System.IO.TextReader and friends. These type have to be removed from CoreLib now to avoid type identity mismatches.

Commit migrated from https://github.com/dotnet/coreclr/commit/8e5272219f343d34c2255f3b3b839e9f1c90e630