[llvm] [X86] Fold concat(PCMP*(), PCMP*()) -> CMPPS(concat, concat) on AVX1 targets (PR #95915)

[via llvm-commits]

goldsteinn wrote:

Wonder if this code would fit in `simplifySExtOfDecomposedSetCCImpl` of https://github.com/llvm/llvm-project/pull/82290.

I'm about to board a flight so don't have time to check now, but will likely tomorrow.

https://github.com/llvm/llvm-project/pull/95915