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

[Carl Ritson via llvm-commits]

perlfu wrote:

> Delete east const.

Removing this globally from the code creates a lot of diffs unrelated to this change.
If that is the desire then it should be a separate PR.


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