[PATCH] SSE pslldq/psrldq shuffle mask decodes

[Simon Pilgrim]

The decoder always creates a byte-vector shuffle mask. I've altered the arguments to (hopefully) make this clear. 

Rebased tests.

http://reviews.llvm.org/D5598

Files:
  lib/Target/X86/InstPrinter/X86InstComments.cpp
  lib/Target/X86/Utils/X86ShuffleDecode.cpp
  lib/Target/X86/Utils/X86ShuffleDecode.h
  test/CodeGen/X86/vector-shuffle-128-v8.ll
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