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

[Karthik Bhat]

Hi All,
Updated the code to address Adam,Renato's comments.
Following are the changes-

1. Moved Enums inside structs.
2. Marked local functions in struct as static.
3. Moved functions inside of ReductionDescriptor.

No functionality change/No Regressions observed. 
Please let me know your comments on the same.

Thanks and Regards
Karthik Bhat


http://reviews.llvm.org/D9046

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

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