https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64265
--- Comment #13 from Dmitry Vyukov <dvyukov at google dot com> ---
> ... we actually don't want any __tsan_func_{entry,exit} calls if there are no
> memory accesses in the function...
... and no calls to other functions, because these functions can contain memory
accesses and tsan needs func_entry/exit to maintain stack traces.
