[Bug sanitizer/125224] ASAN_* internal function documentation is lacking

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125224

--- Comment #3 from Drea Pinski <pinskia at gcc dot gnu.org> ---
ASAN_CHECK:
arg0: flags
arg1: base/ptr
arg2: length
arg3: alignment

ASAN_CHECK flags:
  ASAN_CHECK_STORE// = 1 << 0,
  ASAN_CHECK_SCALAR_ACCESS// = 1 << 1,
  ASAN_CHECK_NON_ZERO_LEN// = 1 << 2,
  ASAN_CHECK_LAST// = 1 << 3