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

[Artem Trokhymchuk via llvm-commits]

trokhymchuk wrote:

While running regression tests found problem with `Transforms/PGOProfile/chr.ll` test, looks like current optimization applies there also, fixed in the separate commit (b65aa2db7b0a47e32711adeb81962e72bd4f43e6) (pls comment if the commit must be squashed with previous)

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