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Simon Pilgrim
7fc239ff4e
[X86][SSE] Add LowerVectorAllZero helper for checking if all bits of a vector are zero.
Pull the lowering code out of LowerVectorAllZeroTest (and rename it MatchVectorAllZeroTest). We should be able to reuse this in combineVectorSizedSetCCEquality as well. Another cleanup to simplify D81547.
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