[Bug tree-optimization/92860] [9/10/11/12 regression] Global flags affected by -O settings are clobbered by optimize attribute

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92860

--- Comment #90 from Martin Liška <marxin at gcc dot gnu.org> ---
Note that I can bootstrap with -O3 -march=native on bdver1 when I apply the fix
for PR103905.