[PATCH] Add control dependence computation that computes control dependence equivalence classes.

[Daniel Berlin]

Update for review comments (whitespace fixes, refactoring of helpers and main DFS walk).


http://reviews.llvm.org/D8568

Files:
  include/llvm/Analysis/ControlDependenceEquivalence.h
  include/llvm/Analysis/Passes.h
  include/llvm/InitializePasses.h
  include/llvm/LinkAllPasses.h
  lib/Analysis/Analysis.cpp
  lib/Analysis/CMakeLists.txt
  lib/Analysis/ControlDependenceEquivalence.cpp
  test/Analysis/ControlDependence/testdiamond.ll
  test/Analysis/ControlDependence/testembeddeddiamond.ll
  test/Analysis/ControlDependence/testifinloop.ll
  test/Analysis/ControlDependence/testloop.ll
  test/Analysis/ControlDependence/testnomergebranch.ll
  test/Analysis/ControlDependence/teststraightline.ll
  test/Analysis/ControlDependence/testunreachableinfiniteloop.ll

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