[Bug gcov-profile/80952] gcc 7.1.1 has a drastic performance downgrade using "-fprofile-arcs" compared to 6.3.1 version

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80952

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think it might be interesting to optimize relaxed atomic adds such that we
can pull the add out if the loop.