[SSE] Fix for MUL v16i8 on pre-SSE41 targets (PR23369).
Sign extension of i8 to i16 was placing the unpacked bytes in the lower byte instead of the upper byte. llvm-svn: 236209
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Sign extension of i8 to i16 was placing the unpacked bytes in the lower byte instead of the upper byte. llvm-svn: 236209