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

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

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

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