[Bug c/116642] miscompilation involving vfork child.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116642

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>either modifies any data other than a variable
       of type pid_t used to store the return value from vfork()

Is the case here.