[Bug other/90257] [9/10 Regression] 8% degradation on cpu2006 403.gcc starting with r270484

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90257

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Let's revert the offending commit on the branch but keep it on trunk for
further investigation.  PR90178 was only a missed optimization.