[llvm] [X86] Try Folding icmp of v8i32 -> fcmp of v8f32 on AVX (PR #82290)

[via llvm-commits]

goldsteinn wrote:

> > @goldsteinn Would you be willing to split the bitcast comparisons into a followup patch and just get the int2fp version done first?
> 
> Will do.

Err, I think the fix for both is pretty trivial. I'll post 1 more time with complete. If any more concerns
ill drop the bitcast aspect.

https://github.com/llvm/llvm-project/pull/82290