[Bug target/104122] On Zen3, 510.parest_r (built with -Ofast) is faster with generic than with native tuning

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104122

--- Comment #1 from Martin Jambor <jamborm at gcc dot gnu.org> ---
On the said EPYC machine, I could see 6% regression at -O2 as well and then
confirmed it on the Ryzen.  Again, historical data suggests generic improved
more than native and we already had a 4% regression when gc11 was released.