[clang][HLSL] Add GroupMemoryBarrierWithGroupSync intrinsic#111883

Merged

adam-yang merged 8 commits intollvm:mainfrom

adam-yang:hlsl-barrier-clang

Dec 3, 2024

Commits on Dec 2, 2024

Added the intrinsic to clang
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Tests fixed
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Fixed formatting, missing hlsl prefix in the builtin, and reflected the naming changes in the intrinsics
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Moved error test to the test folder. Changed lib shader model to 6.3
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Removed unneeded `-verify-ignore-unexpected` in the errors test. Removed the unneeded arguments in the builtin definition
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No longer checking the args for the builtin, since the declaration no longer has any arguments
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Fixed deprecated call and test
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Fixed stray deletion of line from rebasing
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