[llvm] [InstCombine] Fold -X / -Y -> X / Y (PR #88422)

[Yingwei Zheng via llvm-commits]

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

LGTM. But I will leave it to other reviewers to decide if we should merge this patch.


https://github.com/llvm/llvm-project/pull/88422