[X86][SSE] Add SimplifyDemandedVectorElts HADD/HSUB handling.
Still missing PHADDW/PHSUBW tests because PEXTRW doesn't call SimplifyDemandedVectorElts llvm-svn: 360526
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Still missing PHADDW/PHSUBW tests because PEXTRW doesn't call SimplifyDemandedVectorElts llvm-svn: 360526