[PATCH] Quick look-up for block in loop

[Wan, Xiaofei]

  Update according Andy's comments.

Hi atrick,

http://llvm-reviews.chandlerc.com/D2014

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2014?vs=5132&id=5167#toc

Files:
  lib/Analysis/LoopInfo.cpp
  lib/Transforms/Utils/LCSSA.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  include/llvm/Analysis/LoopInfo.h
  include/llvm/Analysis/LoopInfoImpl.h
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