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

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

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

It is a compile-time test. Diff: https://github.com/dtcxzyw/llvm-opt-benchmark/pull/2120


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