[X86] combineConcatVectorOps - add handling to concat setcc instructions together #170295
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…ons together So far this only handles AVX512 predicate masks, which is by far the easiest to support - AVX1/AVX2 support can mostly be dealt with via CMPP + CMPEQ/GT nodes (but these still fail for some icmp expansions where nodes have multiple uses).
RKSimon
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Some of the AVX512 cases are already handled by llvm#170295
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So far this only handles AVX512 predicate masks, which is by far the easiest to support - AVX1/AVX2 support can mostly be dealt with via CMPP + CMPEQ/GT nodes (but these still fail for some icmp expansions where nodes have multiple uses).