[llvm] [InstCombine] Support gep nuw in icmp folds (PR #118472)

[Nikita Popov via llvm-commits]

nikic wrote:

@davidben I have implemented the change to `-fsanitize=pointer-overflow` in https://github.com/llvm/llvm-project/pull/120719.

https://github.com/llvm/llvm-project/pull/118472