[PATCH] [LoopReroll] Introduce the concept of DAGRootSets.

[James Molloy]

Updated to address all of Hal's comments.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7439

Files:
  lib/Transforms/Scalar/LoopRerollPass.cpp
  test/Transforms/LoopReroll/basic.ll

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