[PATCH] [X86][SSE] psrl(w/d/q) and psll(w/d/q) bit shifts for SSE2

[Chandler Carruth]

I think this code is pretty nice.

I have a minor simplification of it, but I'm happy to just apply that in a follow-up patch. Go ahead and submit this one as-is.


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  rL LLVM

http://reviews.llvm.org/D6649

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