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

[Artem Trokhymchuk via llvm-commits]

trokhymchuk wrote:

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

yep, my bad, messed with comparators and did not check the optimization result ones, fixed now, @dtcxzyw pls take a look

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