[PATCH] Make the byte-shift SSE intrinsics emit vector shuffles which we know the backend can handle.

[Filipe Cabecinhas]

Alex: Thanks for reminding me! He prepared this patch with me and I forgot
to include that in the commit message. Adding it.

Craig: I just want to double-check: clang-format formatted it that way.
Still want me to format it closer to what it was? (since it's an installed
header, you might prefer not strictly following llvm's format)

Thanks,

Filipe


http://reviews.llvm.org/D7199

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