[X86][MMX] Generlize MMX_MOVD64rr combines to accept v4i16/v8i8 build vectors as well as v2i32
Also handle both cases where the lower 32-bits of the MMX is undef or zero extended. llvm-svn: 325736
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Also handle both cases where the lower 32-bits of the MMX is undef or zero extended. llvm-svn: 325736