[Bug tree-optimization/90610] [10 Regression] 526.blender_r miscompared on znver1 with -Ofast -march=native since r271463

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90610

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Happens also for --size=train and following files are different after the
revision:

    56/  1040: blender/source/blender/blenkernel/intern/camera.o: different
    64/  1040: blender/source/blender/blenkernel/intern/curve.o: different
    69/  1040: blender/source/blender/blenkernel/intern/displist.o: different
    87/  1040: blender/source/blender/blenkernel/intern/implicit.o: different
    91/  1040: blender/source/blender/blenkernel/intern/lattice.o: different
   100/  1040: blender/source/blender/blenkernel/intern/mesh.o: different
   553/  1040: blender/source/blender/editors/space_view3d/drawobject.o:
different
   668/  1040: blender/source/blender/modifiers/intern/MOD_smooth.o: different
   895/  1040: blender/source/blender/render/intern/source/rayshade.o:
different
   910/  1040: blender/source/blender/render/intern/source/zbuf.o: different