[x86/Linux] Enable thread-abort reraise loop prevention (dotnet/coreclr#12646)

Commit migrated from https://github.com/dotnet/coreclr/commit/e5557aea38564be9c2e1630ae7b075c3b76837b3

[RyuJIT/ARM32] Fix assertion failed 'gcPtrCount == 0' (dotnet/coreclr#12621)

* [RyuJIT/ARM32] Fix assertion failed 'gcPtrCount == 0'

Change wrong gcPtrCount's value from gtNumSlots to gtNumberReferenceSlots of GenTreePutArgStk

* Fix a formatting error

Commit migrated from https://github.com/dotnet/coreclr/commit/7e15d8f121df2f51e1eff74e765e64109a9574c0

Merge pull request dotnet/coreclr#12647 from dotnet/mirror-merge-9210244

Mirror changes from dotnet/corert

Commit migrated from https://github.com/dotnet/coreclr/commit/474d9618e844e9a0fb3fd2b687d558d1239b021d

Fix the merge from the corert changes

Commit migrated from https://github.com/dotnet/coreclr/commit/d11d281a2141bb6880371d878d558859c56f4901

Merge pull request dotnet/corertdotnet/coreclr#4080 from dotnet/nmirror

Merge nmirror to master

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>
Commit migrated from https://github.com/dotnet/coreclr/commit/9673552bb036470ebb57aa647d0995686cbd94c8

Merge pull request dotnet/coreclr#12606 from adityamandaleeka/mask_activation_on_altstack

Mask INJECT_ACTIVATION_SIGNAL while on alternate signal stack

Commit migrated from https://github.com/dotnet/coreclr/commit/334259414f8455b93989ee1ac01a7facbdff8950

Mask INJECT_ACTIVATION_SIGNAL while on alternate signal stack.

Commit migrated from https://github.com/dotnet/coreclr/commit/94f2d05cd8e2f0d0be0e264b808dccb58b5d8f33

Update gtDispRegVal() for multi register nodes (dotnet/coreclr#12573)

* Update gtDispRegVal() for multi register nodes

* [RyuJIT/armel] Fix

Commit migrated from https://github.com/dotnet/coreclr/commit/bcfb4b64f2f5186318410d5054486e8a948271ca

Cleanup officialbuild warnings (dotnet/coreclr#12578)

* Cleanup officialbuild warnings

* Re-enable "sync test native binaries" step

Commit migrated from https://github.com/dotnet/coreclr/commit/511099820df8a8ab750a436d5f78ebb9e8b43df1

Merge pull request dotnet/coreclr#12619 from parjong/fix/merge_jit_and_engine

Fix missing references in FEATURE_MERGE_JIT_AND_ENGINE

Commit migrated from https://github.com/dotnet/coreclr/commit/a211a077bd199cf5ea27f4983a13d77a9efba8f2

Merge pull request dotnet/coreclr#12637 from parjong/fix/skipcrossgen

Add skipcrossgen option

Commit migrated from https://github.com/dotnet/coreclr/commit/5ea45b71361607e99d752615c491600ac4fafeca

Merge pull request dotnet/coreclr#12575 from wateret/armel/floatret

[RyuJIT/armel] Move returned float to float reg

Commit migrated from https://github.com/dotnet/coreclr/commit/866d4189c77a703e6af805646e927266222d8876

Add skipcrossgen option

Commit migrated from https://github.com/dotnet/coreclr/commit/6193e8b18c29a62d12e36c6d2fbc86ca91f287d1

Support interprter build when INTERP_TRACING is not set (dotnet/coreclr#12625)

Commit migrated from https://github.com/dotnet/coreclr/commit/17b815123a609a4c326875ff845a8e70aaab278c

Remove unused global variable (dotnet/coreclr#12620)

Commit migrated from https://github.com/dotnet/coreclr/commit/b063eb64d5f7fa229677934b9a8f83ef46a7423c

Hide methods in IdDispenser (instead of using DacNotImpl) (dotnet/coreclr#12624)

Commit migrated from https://github.com/dotnet/coreclr/commit/85e8f7b2e1fca663e55e37f396c85f60e0375935

Update to latest System.Memory

Commit migrated from https://github.com/dotnet/coreclr/commit/f738e8861a5705dbd74a3088c0f4a1ee4e15935d

Update CoreClr, CoreFx to preview2-25504-01, preview2-25504-01, respectively

Commit migrated from https://github.com/dotnet/coreclr/commit/bc8b81b75bf43ea707e0d47b00da34a68f795194

Delete unnecessary code (dotnet/coreclr#12607)

Commit migrated from https://github.com/dotnet/coreclr/commit/38a2a69c786e4273eb1339d7a75f939c410afd69

[RyuJIT/armel] Move returned float to float reg

Returned float values are in r0(float) or r0:r1(double).
These values must be moved to proper float register after call.

Fix dotnet/coreclr#12574

Commit migrated from https://github.com/dotnet/coreclr/commit/305ddc1380e3373e7b5422ada70f100b38ccedc1

Fix missing refernces in FEATURE_MERGE_JIT_AND_ENGINT

Commit migrated from https://github.com/dotnet/coreclr/commit/06a7b5b7c6cbaf2390a3916fbfb1b3ea06a7e420

Merge pull request dotnet/coreclr#12608 from pgavlin/FixDSE

Fix a bug in LIR dead store removal.

Commit migrated from https://github.com/dotnet/coreclr/commit/77ac6921d8b6b23e682adc42440501e34a083720

create GetAssertionIndex to convert from unsigned to AssertionIndex (dotnet/coreclr#12554)

Commit migrated from https://github.com/dotnet/coreclr/commit/2b5da8429093ad757849686fd668330a3102a1a5

Fix a bug in LIR dead store removal.

This came in with the recent operand visitor changes: instead of marking
the operands of a dead indirect store unused, DSE would mark the operands
of its address unsued.

Commit migrated from https://github.com/dotnet/coreclr/commit/bee2ec645438be185bb77371b0eb5093573f7b9d

[x86/Linux] Restore PTR_MethodTable in FastPrimitiveArrayAllocator (dotnet/coreclr#12569)

Commit migrated from https://github.com/dotnet/coreclr/commit/9665cb5b9af94cccaa2e127337ff6d471ea18a0b

Move the bitset iterator for bitsetasuint64inclass inside the bitset. (dotnet/coreclr#12553)

It is how it is done for others bitsets.

Commit migrated from https://github.com/dotnet/coreclr/commit/01088c7b3e47e22c08bfcdc3a73dc5f7a7f1696e

Improve fgAddRefPred (dotnet/coreclr#12585)

* Improve fgAddRefPred

Only do one search through the predecessor list looking for an
existing predecessor edge, or looking for the proper location to
insert a new predecessor edge. Previously, we traversed the list
twice (or part of twice) for new edges. For new edges, stop the
search when we reach the correct location in sorted order.

This reduces x86 release minopts instruction count by 0.42% and
full opts instruction count by 0.33% (of a superpmi replay of
the tests).

Fixes dotnet/coreclr#12582

* Update for feedback

Commit migrated from https://github.com/dotnet/coreclr/commit/58d0ead6d34837fab60da1473090588db415fc1d

Merge pull request dotnet/corertdotnet/coreclr#4046 from dotnet/nmirror

Merge nmirror to master

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>
Commit migrated from https://github.com/dotnet/coreclr/commit/bfc3141f97a9f9f0d095f3d2e99a7c02ce869ab0

Reducing diffs with CoreRT (dotnet/coreclr#12579)

* Rename m_firstChar to _firstChar to reduce CoreRT diffs
* Reducing diffs with CoreRT
* Delete dead code

Commit migrated from https://github.com/dotnet/coreclr/commit/57214f1948e56835cde1b6162acc58751f483e14

Merge pull request dotnet/coreclr#12568 from hseok-oh/ryujit/fix_11781

[RyuJIT/ARM32] Fix using fgMorphMultiregStructArg for mkrefany

Commit migrated from https://github.com/dotnet/coreclr/commit/3390498956eeccd6d4813fb65d534e6108c16ebb

Remove unnecessary update of RegRecord in LSRA (dotnet/coreclr#12474)

* Remove unnecessary update of RegRecord

We don't need to clear assignedInterval of regRec,
because it was already cleared by checkAndClearInterval() above.

Signed-off-by: Hyung-Kyu Choi <hk0110.choi@samsung.com>
* Apply review feedback

- Add a assertion and comment for the assertion

Signed-off-by: Hyung-Kyu Choi <hk0110.choi@samsung.com>
Commit migrated from https://github.com/dotnet/coreclr/commit/f0d3c439dc16a3218d53578f14c973696de04cb1

[RyuJIT/ARM32] Return HFA struct (dotnet/coreclr#12453)

* [RyuJIT/ARM32] Return HFA struct

- Enable return HFA struct
- Merge ARM32/ARM64 CodeGen::isStructReturn(GenTreePtr treeNode)
- Merge ARM32/ARM64 CodeGen::genStructReturn(GenTreePtr treeNode)

* Add comment

Add TODO comment to optimize two-float loading

Commit migrated from https://github.com/dotnet/coreclr/commit/7318ee5ce4306030908e6c88fd9b908914d4c685

Merge pull request dotnet/coreclr#12539 from ellismg/update-prerelease-tag

Update to master prerelease2 tag

Commit migrated from https://github.com/dotnet/coreclr/commit/abc11397af25d50159e35538569eae581d0dbdbf

Merge pull request dotnet/coreclr#12527 from gsfreema/relative-paths

Fix contributing workflow commit message link

Commit migrated from https://github.com/dotnet/coreclr/commit/eaab9f34b0f5e139af82ef9aea09ee2fdb8badcc

Fix an issue where g_ephemeral_low would never get bashed into the write (dotnet/coreclr#12563)

barrier when starting up with Server GC (x86 only).

Commit migrated from https://github.com/dotnet/coreclr/commit/7a283118b871458fd46d4593f2e6e3126701e4bc

Merge pull request dotnet/coreclr#12577 from dpodder/optdata-170630

Update optdata to version 20170630-0138

Commit migrated from https://github.com/dotnet/coreclr/commit/e95af8cc002e49592fe4d6b20b03330eb4ffd41a

Merge pull request dotnet/coreclr#12236 from rartemev/fix_legacyjit_tests

Fix legacyjit CI testing

Commit migrated from https://github.com/dotnet/coreclr/commit/2beb07a856087b65a4729ddfb20701e244039f59

Merge pull request dotnet/coreclr#12570 from mskvortsov/FixVisitOperands

Add a missing case to GenTree::VisitOperands()

Commit migrated from https://github.com/dotnet/coreclr/commit/e221e6dacc3f99fa07a8ed85118ddced08fa536e

Merge pull request dotnet/coreclr#11815 from hseok-oh/ryujit/struct_split_small

[ARM32/RyuJIT] Lowering: split struct argument less than 16 bytes

Commit migrated from https://github.com/dotnet/coreclr/commit/3289665bd616268501e190ff39fc51a9f2f55253

Merge pull request dotnet/coreclr#12576 from gsfreema/readme-fixes

README.md link and grammar fixes

Commit migrated from https://github.com/dotnet/coreclr/commit/f2a6b13e6f1335fb2f2a8ddfc2510a77adf0931c

Merge pull request dotnet/coreclr#12559 from rartemev/fix_build_break

Fix build failure in internal builds

Commit migrated from https://github.com/dotnet/coreclr/commit/f7844f7373b66e434e7be183615559f915835ce4

Update optdata to version 20170630-0138

Commit migrated from https://github.com/dotnet/coreclr/commit/ee112f8a92c073b6b9b3fe16f7e5a9e7a5d35a2d

README.md link and grammar fixes

Fixing various typos, grammar mistakes, and broken links in the root README.md file.

Commit migrated from https://github.com/dotnet/coreclr/commit/18ac27fa981bba7c316693ed396bd4f816658932

Add a missing case to GenTree::VisitOperands()

Commit migrated from https://github.com/dotnet/coreclr/commit/d91e7dc88fe9739b78152b2d3ac11ce1777560e9

Merge pull request dotnet/coreclr#12566 from adityamandaleeka/fix_license_header_winrtdq

Fix license header on new file

Commit migrated from https://github.com/dotnet/coreclr/commit/f89ac1a9ac71e2f0f21bdb0b2fc6f68d71a3021c

Merge pull request dotnet/coreclr#12540 from pgavlin/OperandVisitor

Add a generic operand visitor to `GenTree`.

Commit migrated from https://github.com/dotnet/coreclr/commit/f9153d20ab61808722a8a2d91c75e08e32a0c765

[ARM32/RyuJIT] Lowering: enable passing split struct less than 16 bytes

- Enable passing split struct (less than 16 bytes) in registers and on stack
morphing phase
Lowering phase
- Block at LSRA phase - add NYI_ARM
- Print split struct

Commit migrated from https://github.com/dotnet/coreclr/commit/049c9d4f5325478d6e4df762424d8d49c7963427

[RyuJIT/ARM32] Fix using fgMorphMultiregStructArg for mkrefany

Block using fgMorphMultiregStructArg function for mkrefany.
Morphing for mkrefany struct is already done in fgMorphArgs function.

Commit migrated from https://github.com/dotnet/coreclr/commit/cca7f0222af47a93a735e69e59e0b76c237f5f88

Fix license header on new file.

Commit migrated from https://github.com/dotnet/coreclr/commit/6ef9321c6db490fc16b63c948e27645c4931c913

Merge pull request dotnet/coreclr#12535 from adityamandaleeka/dispatcher_queues_coreclr

Support DispatcherQueues when getting WinRT dispatcher

Commit migrated from https://github.com/dotnet/coreclr/commit/f024e166d69ba4d82544e868a5544d7edece5e43

Make libnuma soft dependency (dotnet/coreclr#12556)

Load libnuma dynamically, so it is not linked at compile time and
hence avoid making it a hard dependency at runtime.

Commit migrated from https://github.com/dotnet/coreclr/commit/08d6a06f1da7be86ef34284fccf63cea68c6d90f

Merge pull request dotnet/corertdotnet/coreclr#4004 from dotnet/nmirror

Merge nmirror to master

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>
Commit migrated from https://github.com/dotnet/coreclr/commit/aa451e8fcf9edd2fda0d93b3b2155f6d7a7d7216

Use public ConditionalWeakTable iterator (dotnet/coreclr#12564)

Port https://github.com/dotnet/corert/pull/4030/commits/dotnet/coreclr@a3837f7fc60a1b7db872cfef6463f74fb1ffeafb to CoreCLR

Commit migrated from https://github.com/dotnet/coreclr/commit/8279ba85a79c5293aa06b56a4ff8de67971a43c4

Move JIT_TrialAlloc declaration into jitinterfacex86.cpp (dotnet/coreclr#12562)

Commit migrated from https://github.com/dotnet/coreclr/commit/a8ec0b0421c89f0c301c647f95aa336bc45bbf28

Remove m_ prefixes in BinaryReader.cs (dotnet/coreclr#12561)

Commit migrated from https://github.com/dotnet/coreclr/commit/31cc09c7c2f5dbd43c3bff24bc2f94eec2cf4085

Merge pull request dotnet/coreclr#12557 from briansull/add-verbose

Implement a /verbose flag to show the verbose output from crossgen

Commit migrated from https://github.com/dotnet/coreclr/commit/1ee52501659bbe65cf90688f5be9783df97de11b

Address PR feedback.

Commit migrated from https://github.com/dotnet/coreclr/commit/39fdf401557137118a6f313a730ead2cb6e036dd

Format code.

Commit migrated from https://github.com/dotnet/coreclr/commit/2d67ab00478aaf2957b36d62de5a8526e65b4c56

Implement a /verbose flag to show the verbose output from crossgen

Added info on /verbose option to PrintUsageHelper()
Convert printf(ascii) to wide strings in methodtable.cpp
In build.cmd echo the crossgen /CreatePdb command line

Commit migrated from https://github.com/dotnet/coreclr/commit/60e038191307535ea6c073b8fb249dce45b071f7

Fix build failure in internal builds

Commit migrated from https://github.com/dotnet/coreclr/commit/a3648f6139f5a7d9b091e530caeeff907ecf6f72

Change LSRA to use the operand visitor.

Commit migrated from https://github.com/dotnet/coreclr/commit/365b48a50a379916bc7543488db73d892f39ce30

Refactor LSRA's operand use builder.

Commit migrated from https://github.com/dotnet/coreclr/commit/5fcc39e514645dd7c33b327250e7b1c8c86814f4

Replace some uses of the operand iterator with the operand visitor.

Commit migrated from https://github.com/dotnet/coreclr/commit/a42c14bf27c651669e9f8f2dfa3bd2d74662d427

Add a generic operand visitor to `GenTree`.

This visitor accepts any invokable argument (e.g. lambdas, functors,
etc.) with the following signature:

    `GenTree::VisitResult Visitor(GenTree* operand)`

This visitor is typically more efficient than the operand iterator
due to better opportunities for inlining and shorter dynamic path
lengths when deciding which operands need to be visited.

Commit migrated from https://github.com/dotnet/coreclr/commit/9f9a7efe3950c8cb22ffdfc7074e26c350bb4b6a

Make ResourceManager netstandard 2.0 API behave correctly (dotnet/coreclr#12536)

* Make ResourceManager netstandard 2.0 API behave correctly

In netstandard 2.0 we have enabled the APIs like GetObject, GetStream,..etc. these are not functioning correctly in UWP apps because was assuming we always uses PRI files. The changes here is to initialize the managed resources too and let these APIs behave as if we are running inside desktop app.

* added #ifdef

* Remove the throwing as PRI can handle case insenitive lookup

* remove un-needed resources

Commit migrated from https://github.com/dotnet/coreclr/commit/88e0428caa33fd04bd8f5f8bc1a60b6a44b93622

Merge pull request dotnet/coreclr#12532 from jashook/fix_arm64_and_arm32_package_restore

Fix the package restore for arm64 and arm32

Commit migrated from https://github.com/dotnet/coreclr/commit/07258b7ac54cef46ef143b450d6e607fd4a017db

Use the number of GC threads to calculate spin count (dotnet/coreclr#12525)

* use the number of gc threads to calculate spin count

* use n_heaps

Commit migrated from https://github.com/dotnet/coreclr/commit/3bd82d1935806a87d668f4ea102de37077996005

Fix the package restore for arm64 and arm32

Commit migrated from https://github.com/dotnet/coreclr/commit/0489dac17a1bf5d9698ae4717e5cfe0b762e5a7d

Merge pull request dotnet/coreclr#12538 from dotnet-bot/from-tfs

Merge changes from TFS

Commit migrated from https://github.com/dotnet/coreclr/commit/c611d0dcde99aab29490d3cf62f86cc79462db9a

Merge pull request dotnet/coreclr#12360 from wateret/armel/dblarg

[RyuJIT/armel] Support `double` argument passing

Commit migrated from https://github.com/dotnet/coreclr/commit/f8267f2f8f1f458cf15690c2e5ed68c8b1c56916

Delete file moved to shared partition

Commit migrated from https://github.com/dotnet/coreclr/commit/3bda40fda2b222a2e4ebe9dc3dbee603ebeeecab

Merge pull request dotnet/corertdotnet/coreclr#4004 from dotnet/nmirror

Merge nmirror to master

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>
Commit migrated from https://github.com/dotnet/coreclr/commit/649ea074fb8d48b3c2e93857efb80a9649484745

Reduce the verbosity of optdata sync on stdout (dotnet/coreclr#12543)

Set the "StandardOutputImportance" attribute on the RestoreOptData
target to low, matching the "RestoreNETCorePlatforms" target. Logging
to sync.log remains verbose, but stdout on the console is made much less
verbose.

Fixes dotnet/coreclr#12127

Commit migrated from https://github.com/dotnet/coreclr/commit/e6fe4aad7fdc7cf4db42753e8ad6e73fa0a7db15

Fix GC contract violation (dotnet/coreclr#12542)

Commit migrated from https://github.com/dotnet/coreclr/commit/03bec77fb4efaa397248a2b9a35c547522221447

Delete test that tests pinning of System.Object (dotnet/coreclr#12537)

See dotnet/corefxdotnet/coreclr#21673 for motivation. This test fails on CoreRT.

Commit migrated from https://github.com/dotnet/coreclr/commit/98d19c577c4fdeade912eceef4575e984ec3ce19

[RyuJIT/armel] Support `double` argument passing

- Fix for putting `double` arguments between Lowering and Codegen phase
- Rename GenTreeMulLong to GenTreeMultiRegOp
  GT_PUTARG_REG could be GenTreeMultiRegOp on RyuJIT/arm

Fix dotnet/coreclr#12293

Commit migrated from https://github.com/dotnet/coreclr/commit/55eede4c2ad0c5f4849fda9544138f9096847ba4

[x86/Linux] Adjust SP in throwing helper block (dotnet/coreclr#12504)

* [x86/Linux] Adjust SP in throwing helper block

* Fix format error

* Use funKind intead of siInFuncletRegion

* Use genSPtoFPdelta (and add some comments)

* Fix a typo

* Revert irrelevant changes

Commit migrated from https://github.com/dotnet/coreclr/commit/cee0765158694f0715440987974d34dea8e6edd9

Update to master prerelease2 tag

release/uwp6.0 is going to use preview1 and we don't want to publish
different versions of the package with the same package identity

Commit migrated from https://github.com/dotnet/coreclr/commit/dfa1494d79b3a09e67c0f5e6e0a85a20105c3118

Merge pull request dotnet/coreclr#12528 from pgavlin/NoPgoOption

Add a flag to build.{sh,cmd} to disable PGO.

Commit migrated from https://github.com/dotnet/coreclr/commit/b38cfeb7b14de9ce182f06b8840f1ccd80ec0095

Merge pull request dotnet/coreclr#12534 from dotnet-bot/from-tfs

Merge changes from TFS

Commit migrated from https://github.com/dotnet/coreclr/commit/6c99e9ed55429545624a0932897d9686fa582fb1

Merge pull request dotnet/coreclr#12487 from pgavlin/GenTreeVisitor

Add a new, faster tree walker.

Commit migrated from https://github.com/dotnet/coreclr/commit/92206031704cd7e4249a8c67d75d42f776b81ae2

Remove unreached() macro

[tfs-changeset: 1663789]

Commit migrated from https://github.com/dotnet/coreclr/commit/aafcd933142ef63655b9e4616fb5e712e1c67afc

Support DispatcherQueues when getting WinRT sync context.

Commit migrated from https://github.com/dotnet/coreclr/commit/5d4d1875f3bdaf2edea806cd0b0f60bcfe69e00e

Merge pull request dotnet/coreclr#12531 from dotnet-bot/from-tfs

Merge changes from TFS

Commit migrated from https://github.com/dotnet/coreclr/commit/69afbba312e00845cc1440f0e1be2f04a41be841

Fix a release build break.

[tfs-changeset: 1663777]

Commit migrated from https://github.com/dotnet/coreclr/commit/a36de6744ebccc7610f9c0d7d97c9f2a19d10727

Move ReaderWriterLockSlim to shared partition

Commit migrated from https://github.com/dotnet/coreclr/commit/474f4197003266237c8063cc0fa910baf702cc53

Enable SourceBranch to be passed from the pipeline parameters

Enable SourceBranch to be passed from the pipeline parameters

Commit migrated from https://github.com/dotnet/coreclr/commit/7ba62129cd7ab7604f7e9ae4a116853a828b5c7f

Format code.

Commit migrated from https://github.com/dotnet/coreclr/commit/0fc2159768651b006e6b72425d97d4f28c92ce54

Address PR feedback.

Commit migrated from https://github.com/dotnet/coreclr/commit/71e5888964dcb725088a0d4b54027b72bcf0eb2d

Fix build error

[tfs-changeset: 1663755]

Commit migrated from https://github.com/dotnet/coreclr/commit/2713c145e485eb78126a1548d91a07295bc13c5e

Fix usage style.

Commit migrated from https://github.com/dotnet/coreclr/commit/81f16e41fed6f2d5c21268d5aecf37352493a7a3

Reduce excessive loop count in interlocked tests (dotnet/coreclr#12222)

Commit migrated from https://github.com/dotnet/coreclr/commit/f7f694965abaf85362fb4e6edb221d679bd59cd0

Use proper ifdef for EmitProfilerComCallXXX methods (dotnet/coreclr#12502)

Commit migrated from https://github.com/dotnet/coreclr/commit/aff5a085543f339a24a5e58f37c1641394155c45

Fix debug assert (dotnet/coreclr#12496)

Commit migrated from https://github.com/dotnet/coreclr/commit/cad25d9ce6b6d3d9a1f539cf456c2edc8c2c34af

Fix build error when FEATURE_READYTORUN_COMPILER is disabled (dotnet/coreclr#12505)

Commit migrated from https://github.com/dotnet/coreclr/commit/6decf1a8fea4432d2ab82cceaf73d26bed23db75

Add a flag to build.{sh,cmd} to disable PGO.

This is helpful when performing JIT throughput measurements.

Commit migrated from https://github.com/dotnet/coreclr/commit/3c1c553bc9c27dab04258ce184c74af151f6a311

[RyuJIT/ARM32] Enable passing large split struct argument (dotnet/coreclr#12050)

* [RyuJIT/ARM32] Enable passing large split struct

This enables passing split struct larger than 16 bytes.
To support splitted struct, it defines new GenTree type - GenTreePutArgSplit.
GenTreePutArgSplit is similar with GenTreePutArgStk,
but it is used for splitted struct only
and it has additional field to save register information.
GenTreePutArgSplit node is generated in lower phase.

* Apply reviews: split struct argument passing

- Fix some comments:
genPutArgSplit, GenTreePutArgStk, GenTreePutArgSplit, NuwPutArg, ArgComplete
- Add assertion check in genPutArgSplit, genCallInstruction
- Rename variable: baseReg
- Change flag for GenTreePutArgSplit: _TARGET_ARM && !LEGACY_BACKEND
- Change type of gtOtherRegs in GenTreePutArgSplit
- Remove duplicated code: NewPutArg
- Implement spill & restore flag for GenTreePutArgSplit

* Apply reviews

- Rebase
- Update managing spillFlag for split struct
- Implement spill & restore code generation
- Fix typos and rename variables
- Fix bug related to print gentree for split struct

* Fix bug and comments

- Fix bug in regset.cpp
- Add comments in morph.cpp's NYI_ARM
- Fix comments' typo in lsraarmarcp.cpp

Commit migrated from https://github.com/dotnet/coreclr/commit/0ce4fab8647ac3fbc200c27adfcf31aaae0f660b

Fix contributing workflow commit message link

A recent change moved the Commit Messages section to a different
markdown file.  This change fixes that link, and provides relative
paths for links where appropiate.  This keeps people in their own
fork of the repo when browsing on github.

Commit migrated from https://github.com/dotnet/coreclr/commit/116178885631e4c6bb87d4dcf2f5e6d82e77850b

Enable SourceBranch to be passed from the pipeline parameters

sets SkipBranchAndVersionOverrides=false so SourceBranch and SourceVersion
are correctly passed through the pipeline file.

set SkipBranchAndVersionOverrides=true for the publish definitions as
they don't build from the SourceBranch and instead use a different
tools branch to do their work.

Commit migrated from https://github.com/dotnet/coreclr/commit/9797dac62b0b890f726e1fca61fbb95a075ac0e3

Convert lvaMarkLclRefs to a visitor.

Commit migrated from https://github.com/dotnet/coreclr/commit/b12d7c81d32518419ca95971399e570181f591a9