[llvm] [InstCombine] Optimize unneeded float to int cast when icmp (PR #155501)

[Yingwei Zheng via llvm-commits]

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

Miscompilation reproducer: https://alive2.llvm.org/ce/z/3hmRxH

https://github.com/llvm/llvm-project/pull/155501