[InstCombine][X86] Add DemandedElts support for 512-bit PMULDQ/PMULUDQ instructions
PMULDQ/PMULUDQ vXi64 instructions only use the even numbered v2Xi32 input elements which SimplifyDemandedVectorElts should try and use. This builds on r290554 which added supported for 128 and 256-bit. llvm-svn: 290582
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