[clang] [llvm] [clang][HLSL][SPRI-V] Add convergence intrinsics (PR #80680)

[Sameer Sahasrabuddhe via cfe-commits]

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https://github.com/ssahasra commented:

LGTM, with a few nits.

For the record, I did not have the bandwidth to comment on the translation from HLSL to SPIR-V. But given that the generated IR passes the verifier, this seems like a correct and very interesting first use of convergence control.

https://github.com/llvm/llvm-project/pull/80680