[PATCH] [analyzer][Review request] Better modelling of memcpy by the CStringChecker (PR16731)

[Антон Ярцев]

  Added more tests based on the examples from our correspondence "new/delete checker LLVM false positives". Also included the test similar to one from PR16731.

Hi jordan_rose, zaks.anna,

http://llvm-reviews.chandlerc.com/D1887

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1887?vs=4803&id=5370#toc

Files:
  include/clang/StaticAnalyzer/Core/Checker.h
  include/clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h
  include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h
  lib/StaticAnalyzer/Checkers/CStringChecker.cpp
  test/Analysis/Inputs/system-header-simulator.h
  test/Analysis/malloc.c
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