[llvm] [AMDGPU] ISel for @llvm.amdgcn.cs.chain intrinsic (PR #68186)

[Jay Foad via llvm-commits]

https://github.com/jayfoad commented:

I don't have the expertise to review this in detail but I've skimmed the code and it looks pretty good to me.

https://github.com/llvm/llvm-project/pull/68186