[clang] [Clang][HIP] Deprecate __hip_atomic_* builtins (PR #189897)

[Matt Arsenault via cfe-commits]

https://github.com/arsenm commented:

I still see all the __hip_atomic uses in the CLR headers. I think those will need to be fixed before handling this 

https://github.com/llvm/llvm-project/pull/189897