[Bug target/84201] 549.fotonik3d_r from SPEC2017 fails verification with -mprefer-vector-width=256 or 512 on Zen

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84201

--- Comment #1 from Martin Jambor <jamborm at gcc dot gnu.org> ---
When benchmarking GCC 8 on an older Ivy Bridge Xeon, I also got 549.fotonik3d_r
verification error just with -Ofast -g -march=native -mtune=native