[X86] getTargetShuffleInputs - add KnownUndef/Zero output support
Adjust SimplifyDemandedVectorEltsForTargetNode to use the known elts masks instead of recomputing it locally. llvm-svn: 374724
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Adjust SimplifyDemandedVectorEltsForTargetNode to use the known elts masks instead of recomputing it locally. llvm-svn: 374724