[llvm] InstSimplify: teach simplifyICmpWithConstant about samesign (PR #125899)

[Nikita Popov via llvm-commits]

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

Looks like the corrected version had no hits on llvm-opt-benchmark: https://github.com/dtcxzyw/llvm-opt-benchmark/pull/2130 Why are we making this change?

https://github.com/llvm/llvm-project/pull/125899