[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 #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I was actually talking about generic atomic add and fetch optimization and not
one directly related to profiling data.