[PATCH] Refactor identification of reductions and expose them as utility functions

[Karthik Bhat]

Hi aschwaighofer, anemet, rengolin,

Hi All,
I would like to reuse LoopVectorizer's code to identify/categorize reductions in one of my Pass. 
Refactor functions/code required to identify a reduction and expose them as utility functions. 
No functionality change.
Please let me know if this is good to commit.

Thanks and Regards
Karthik Bhat

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9046

Files:
  include/llvm/Transforms/Utils/LoopUtils.h
  lib/Transforms/Vectorize/LoopVectorize.cpp

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
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