[X86][SSE] Added SSE41 shuffle combining test file.
Currently just contains one case where we combine to VZEXT_MOVL instead of VZEXT which would avoid the need for a zero vector to be generated llvm-svn: 295721
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Currently just contains one case where we combine to VZEXT_MOVL instead of VZEXT which would avoid the need for a zero vector to be generated llvm-svn: 295721