[llvm] [InstCombine] Do not keep samesign when speculatively executing icmps (PR #127007)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> As an alternative, we can pass `UseInstrInfo=false` to `simplifyICmpInst`.

Is the underlying issue `simplifyICmpInst` though?

https://github.com/llvm/llvm-project/pull/127007