[llvm] AMDGPU: Remove flat/global fmin/fmax intrinsics (PR #105642)

[Gheorghe-Teodor Bercea via llvm-commits]

doru1004 wrote:

@arsenm I am not ok with the removal of these intrinsics that allow direct call to some of these atomics. I think you should keep them while you still do the changes that you want with the other atomicrmw. Your change is not backwards compatible.
It is not yet clear to me if calling create atomicrmw is equivalent to calling the old intrisincs.

https://github.com/llvm/llvm-project/pull/105642