[PATCH] [SCCP] Calculate Null Pointer Comparisons

[Nick White]

Ensure we only replace the conditional if we postdominate it (+test)


http://reviews.llvm.org/D9634

Files:
  include/llvm/Analysis/PostDominators.h
  include/llvm/InitializePasses.h
  include/llvm/Transforms/Utils/Local.h
  lib/Analysis/Analysis.cpp
  lib/Analysis/DivergenceAnalysis.cpp
  lib/Analysis/DomPrinter.cpp
  lib/Analysis/PostDominators.cpp
  lib/Analysis/RegionInfo.cpp
  lib/CodeGen/MachineRegionInfo.cpp
  lib/Passes/PassBuilder.cpp
  lib/Passes/PassRegistry.def
  lib/Transforms/Scalar/SampleProfile.cpp
  lib/Transforms/Scalar/SimplifyCFGPass.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/load-means-not-null.ll
  test/Transforms/SimplifyCFG/phi-undef-loadstore.ll

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