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

[Sameer Sahasrabuddhe via cfe-commits]

ssahasra wrote:

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

Thanks for catching that! I was too focussed on the compiler so far ... will follow up on known uses of `__hip_*` atomics in rocm infrastructure.

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