[PATCH] Add support to recognize non SIMD kind of parallelism in SLPVectorizer

[Karthik Bhat]

Update the patch to fix an issue.
When vectorizing Shuffle Vector instruction make sure that it actually refers to alternate sequence such as add sub sequence and is not reffering to a set of ShuffleVector instruction itself.

http://reviews.llvm.org/D4015

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