[Bug tree-optimization/70214] [4.9/5/6 regression] pthread_kill is not considered a barrier

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70214

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
extern int pthread_kill (pthread_t __threadid, int __signo) __attribute__
((__nothrow__ , __leaf__));