[clang] [Clang] Enable hip_atomic deprecation warning by default (PR #230378)

[via cfe-commits]

easyonaadit wrote:

> Presumably, this will be committed only after we have scrubbed all uses that are under our control?

Yes.

> but should make sure that we've already removed the majority of AMD's internal use of this, otherwise headers will get very noisy.

All the components using this have migrated to the new builtins. Waiting for a few days before merging, so those changes have a chance to land before this.

https://github.com/llvm/llvm-project/pull/230378