[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 #2 from Drea Pinski <pinskia at gcc dot gnu.org> ---
ASAN_MARK:
arg0: POISON/UNPOISON
arg1: base
arg2: length