[PATCH] [analyzer][Bugfix/improvement] Fix for PR16833

[Aleksei Sidorin]

Hi zaks.anna, jordan_rose, krememek,

Create one state for a range switch case instead of multiple.
This is an attempt to fix PR16833 (http://llvm.org/bugs/show_bug.cgi?id=16833).
Please tell me if I'm going in the right direction.

http://reviews.llvm.org/D5102

Files:
  include/clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h
  lib/StaticAnalyzer/Core/ExprEngine.cpp
  lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
  lib/StaticAnalyzer/Core/SimpleConstraintManager.cpp
  lib/StaticAnalyzer/Core/SimpleConstraintManager.h
  test/Analysis/misc-ps.c
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