[PATCH] [analyzer] [proposal] Fix for PR20653

[Aleksei Sidorin]

Check if a region changes instead of look up if a region has bindings.

http://reviews.llvm.org/D5104

Files:
  include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h
  include/clang/StaticAnalyzer/Core/PathSensitive/SymbolManager.h
  lib/StaticAnalyzer/Core/ExprEngine.cpp
  lib/StaticAnalyzer/Core/ProgramState.cpp
  lib/StaticAnalyzer/Core/SymbolManager.cpp
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