[X86][SSE] Add v2f64 u2 shuffle test
Adds missing coverage for SHUFPD undef argument lowering, and also shows a missed opportunity to remove a unnecessary move compared to 02 shuffle mask. llvm-svn: 322175
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Adds missing coverage for SHUFPD undef argument lowering, and also shows a missed opportunity to remove a unnecessary move compared to 02 shuffle mask. llvm-svn: 322175