[release/7.0-rc1] Disable Int128 use in by value ABI scenarios, and fix field layout behavior#74279

Merged

jeffschwMSFT merged 11 commits intorelease/7.0-rc1from

backport/pr-74123-to-release/7.0-rc1

Aug 20, 2022

Commits on Aug 19, 2022

First stab at support for proper 128bit integer layout and abi

davidwrighton
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Add ABI tests for Int128 covering interesting scenarios

davidwrighton
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Fix bugs so that at least Windows Arm64 works

davidwrighton
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Add more types to the ABI tester, so that we cover the Int128 scenarios

davidwrighton
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Revert changes which attempted to enable by value passing for Int128

davidwrighton
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Make Int128 have layout match the expected unmanaged field layout - On Unix platforms (64 bit) use 16 byte alignment - On Arm32 use 8 byte alignment matching the 128 byte vector type - On other Win…

davidwrighton
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Mark Int128 types as not having a stable abi - This disables use of these types for parameter passing in R2R images

davidwrighton
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Address all known issues

davidwrighton
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Try to fix PR job

davidwrighton
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Should fix the test issues

davidwrighton
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Apply suggestions from code review

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