[Bug tree-optimization/121382] [15 Regression] wrong code at -O2 on x86_64-linux-gnu since r15-6657

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121382

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
r16-449-gd884e9c5c746a4 needs picking to be able to backport this plus renaming
of calls to the state of that rev.  But I'm unsure about backporting given
we've only had fuzzing fallout of this bug.