[llvm] [InstCombine] Extend (icmp eq/ne (and Z, X), (and Z, Y)) folds (PR #94867)

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goldsteinn wrote:

Okay, retitled/updated message. Basically we can just extend this fold under the special case that `X ^ Y` is neg p2 / constant.

https://github.com/llvm/llvm-project/pull/94867