[PATCH] [X86][SSE] Added support for SSE3 lane duplication shuffle instructions

[Quentin Colombet]

Hi Simon,

LGTM, but I would rather have two separated commits:

1. Decoding of the mask for the comments.
2. Matching of the DUP instructions.

This is not an absolute requirement though :).

Thanks for the patch!
-Quentin


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http://reviews.llvm.org/D7042

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