[Bug gcov-profile/93623] No need to dump gcdas when forking

[cdenizet at mozilla dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93623

--- Comment #3 from calixte <cdenizet at mozilla dot com> ---
And about fork, no need to lock when resetting in the child process since we've
only one thread.