[llvm] [InstCombine] Fold fcmp of two int-to-fp conversions to an integer compare (PR #210521)

[Lucas Ly Ba via llvm-commits]

lucasly-ba wrote:

> I made one for you just this once, but do not forget to do it next time:
> 
> https://alive2.llvm.org/ce/z/4wW3jB

thanks a lot @AZero13! First contribution to the LLVM optimizer, sorry for missing it, won't forget next time. added it in description

https://github.com/llvm/llvm-project/pull/210521