[PATCH] PR20234 - [SLP Vectorizer] Canonicalize operands of commutitive binary operands.

[Chad Rosier]

Update based on Nadav's feedback.  Specifically, only commute the tree operands.

http://reviews.llvm.org/D4680

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/AArch64/commute.ll
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