[PATCH] Modularizing LICM

[Ashutosh Nema]

Over previous patch this change includes following:

1. LICMSafetyInfo exposed outside with a utility computeLICMSafetyInfo to compute. Earlier 'SinkRegion', 'HoistRegion' and 'PromoteAliasSet' was computing it, re computation was extra expense, to avoid it now the caller to these can compute it and pass it as a argument.

2. Updated comments to functions.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7291

Files:
  include/llvm/Transforms/Utils/LoopUtils.h
  lib/Transforms/Scalar/LICM.cpp

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