[llvm-branch-commits] [llvm] Revert "[Mips] Fix missing sign extension in expansion of sub-word atomic max (#77072)" (PR #88818)

[Quentin Dian via llvm-branch-commits]

DianQK wrote:

> Hi @nikic (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix.

I'm not sure if this description is accurate:
Fix the issue where the atomic instructions on MIPS do not return the correct results.

cc @topperc

https://github.com/llvm/llvm-project/pull/88818