[PATCH] [Polly] Model PHI nodes without demoting them

[Johannes Doerfert]

I don't know what test you exactly want. I added some and also fixed an
inconsistency I encountered along the way. If you want a specific test please
give me some C snippet or a at least a more precise description.


http://reviews.llvm.org/D7415

Files:
  include/polly/ScopDetection.h
  include/polly/TempScopInfo.h
  lib/Analysis/ScopDetection.cpp
  lib/Analysis/ScopInfo.cpp
  lib/Analysis/TempScopInfo.cpp
  lib/Transform/CodePreparation.cpp
  lib/Transform/IndependentBlocks.cpp
  test/ScopInfo/phi_condition_modeling_1.ll
  test/ScopInfo/phi_condition_modeling_2.ll
  test/ScopInfo/phi_conditional_simple_1.ll
  test/ScopInfo/phi_loop_carried_float.ll
  test/ScopInfo/phi_scalar_simple_1.ll
  test/ScopInfo/phi_scalar_simple_2.ll

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