[clang] [llvm] [AMDGPU] Add an option to disable unsafe uses of atomic xor (PR #69229)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> we might document that those are not supported for now. if users really need them, introducing more controls to support them

Sure. I think it's easiest to make progress if we fix the integer cases as a first step 


https://github.com/llvm/llvm-project/pull/69229