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

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goldsteinn wrote:

> ping?

Bah sorry.

It does fit, but it doesn't really change anything of note.

The only change i would like to try to get into this is the equiv `bitcast` logic from https://github.com/llvm/llvm-project/pull/82290

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