[Bug target/94406] 503.bwaves_r is 11% slower on Zen2 CPUs than GCC 9 with -Ofast -march=native

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94406

--- Comment #3 from Martin Jambor <jamborm at gcc dot gnu.org> ---
One more data point, binary compiled for cascadelake does not run on
Zen2, but one for znver2 runs on Cascade Lake and it makes no
difference in run-time.

If disapling epilogues helps on Intel, the difference is less than 2%.