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

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> > As an alternative, we can pass `UseInstrInfo=false` to `simplifyICmpInst`.
> 
> Is the underlying issue `simplifyICmpInst` though?

Yeah. If `UseInstrInfo` is false, we cannot use poison-generating flags.


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