[PATCH] SSE pslldq/psrldq shuffle mask decodes

[Simon Pilgrim]

Hi chandlerc, andreadb,

Patch to provide shuffle decodes and asm comments for the sse pslldq/psrldq byte shift instructions.

Added comments checks to a number of vector insert/shuffle tests (we don't have that many uses cases of slldq/srldq at the moment).

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/vec_insert-5.ll
  test/CodeGen/X86/vector-shuffle-128-v8.ll
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