[llvm] [AMDGPU] Remove support for no-return buffer atomic intrinsics. NFC. (PR #69326)

[Pierre van Houtryve via llvm-commits]

https://github.com/Pierre-vh approved this pull request.

LGTM, I see there was some change in the GISel parts, did you check if there was equivalent logic for the DAG path?

https://github.com/llvm/llvm-project/pull/69326