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

[Henry Wong via Phabricator via cfe-commits]

MTC updated this revision to Diff 146816.
MTC added a comment.

- According to NoQ's suggestion, use `assumeZero()` instead of `isZeroConstant()` to determine whether the value is 0.
- Add test `memset26_upper_UCHAR_MAX()` and `memset27_symbol()`
- Since `void *memset( void *dest, int ch, size_t count );` will converts the value `ch` to `unsigned char`, we call `evalCast()` accordingly.


Repository:
  rC Clang

https://reviews.llvm.org/D44934

Files:
  lib/StaticAnalyzer/Checkers/CStringChecker.cpp
  test/Analysis/bstring.cpp
  test/Analysis/null-deref-ps-region.c
  test/Analysis/string.c

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