[Bug rtl-optimization/92264] [10 Regression] Compile time hog in 521.wrf_r with -Ofast -march=znver2 -g since r276318

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92264

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
WRF initial_config has very very very many (nested) loops to initialize
globals.
IIRC there's a related bug running into the very same issue when prefetching
is enabled.