[PATCH] Loop Rerolling Pass

[hfinkel at anl.gov]

  This should address the remainder of the initial review comments. I've factored out the reduction tracking into its own class, and made a number of other improvements. I've added more function documentation, including documentation on the overall algorithm. Hopefully, this is more reviewable now.

  To be clear, the pass-manager change is only there to ease testing, and would not be committed in this way.

  Thanks again!

Hi nadav, rengolin, atrick,

http://llvm-reviews.chandlerc.com/D1940

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1940?vs=5209&id=5245#toc

Files:
  include/llvm-c/Transforms/Scalar.h
  include/llvm/InitializePasses.h
  include/llvm/LinkAllPasses.h
  include/llvm/Transforms/Scalar.h
  lib/Transforms/IPO/PassManagerBuilder.cpp
  lib/Transforms/Scalar/CMakeLists.txt
  lib/Transforms/Scalar/LoopRerollPass.cpp
  lib/Transforms/Scalar/Scalar.cpp
  test/Transforms/LoopReroll/basic.ll
  test/Transforms/LoopReroll/reduction.ll
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