[Bug lto/66752] spec2000 255.vortex performance compiled with GCC is ~20% lower than with CLANG

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66752

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed by our testers.