[PATCH] D44934: [analyzer] Improve the modeling of `memset()`.

[Henry Wong via Phabricator via cfe-commits]

MTC updated this revision to Diff 145019.
MTC added a comment.

- fix typos
- code refactoring, add auxiliary method `memsetAux()`
- according to a.sidorin's suggestions, remove the useless state splitting.
- make `StoreManager::overwriteRegion()` pure virtual


Repository:
  rC Clang

https://reviews.llvm.org/D44934

Files:
  include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h
  include/clang/StaticAnalyzer/Core/PathSensitive/Store.h
  lib/StaticAnalyzer/Checkers/CStringChecker.cpp
  lib/StaticAnalyzer/Core/ProgramState.cpp
  lib/StaticAnalyzer/Core/RegionStore.cpp
  test/Analysis/bstring.cpp
  test/Analysis/null-deref-ps-region.c
  test/Analysis/string.c

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