[llvm-dev] DAGCombiner folds (xor (and x, y), y) -> (and (not x), y). Can I do the reverse for a target?

[Assem Bsoul via llvm-dev]

I am not sure what is the format for matching this (and (xor x, -1), y) and
generating 2 machine instructions? can you please help!

Thanks,
Assem
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