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f9aef81caa
Teach the GISelKnowBits analysis how to deal with PHI operations. PHIs are essentially COPYs happening on edges, so we can just reuse the code for COPY. This is NFC COPY-wise has we leave Depth untouched when calling computeKnownBitsImpl for COPYs, like it was before this patch. Increasing Depth is however required for PHIs as they may loop back to themselves and we would end up in an infinite loop if we were not increasing Depth. Differential Revision: https://reviews.llvm.org/D73317