[llvm] [AMDGPU] Add dynamic threshold for DPP atomic optimizer on integer LDS atomics (PR #186762)

[Carl Ritson via llvm-commits]

https://github.com/perlfu approved this pull request.

LGTM with a few minor comments.

Please wait a day or so in case there are any comments from other reviewers.

https://github.com/llvm/llvm-project/pull/186762