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

[Nicolai Hähnle via llvm-commits]

https://github.com/nhaehnle commented:

Thanks for taking a look. I haven't fully reviewed it, but it's probably good to go.

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