[PATCH] Enable SLP-vectorization of intrinsics.

[Raul Silvera]

  Addressing comments from Nadav.

  Adopted Nadav's suggestions.
  II2 was meant to be short for 'IntrinsicInst #2'. It is used when we need to
  compare two intrinsics, II and II2. I am open to suggestions
  for better names.

  I haven't done any performance testing; it doesn't catch anything on the
  LLVM unit tests, other than the testcase I added. I think the exposure is
  pretty minimal as it only catches intrinsics, which don't appear to be widely
  used.

Hi hfinkel, nadav,

http://llvm-reviews.chandlerc.com/D2535

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2535?vs=6415&id=6418#toc

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/X86/intrinsic.ll
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