[llvm] [InstCombine] Avoid rewriting multi-use post-inc latch icmps (preserve nsw/nuw for later passes) (PR #215960)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw requested changes to this pull request.

A correctness issue was identified by [llvm-hackme](https://github.com/dtcxzyw/llvm-hackme). Please see the [issue comment](https://github.com/llvm/llvm-project/pull/215960#issuecomment-5277397050) for details.

https://github.com/llvm/llvm-project/pull/215960