[PATCH] [X86][SSE] Add v16i8/v32i8 multiplication support

[Elena Demikhovsky]

The code is correct. I just suggest to divide it in 2-3 functions,
like LowerMUL_v16i8_sse41(), LowerMUL_v16i8_sse2() or you can choose better names.
But it is only my suggestion, you can commit the code as is if you want.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9115

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