Merge 128-bit and 256-bit X86ISD node types for VPERMILPS and VPERMILPD....
Merge 128-bit and 256-bit X86ISD node types for VPERMILPS and VPERMILPD. Simplify some shuffle lowering code since V1 can never be UNDEF due to canonalizing that occurs when shuffle nodes are created. llvm-svn: 145153
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