[Bug target/116799] [14/15 Regression] Miscompiled code on s390x at -O2

[jamessan at jamessan dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116799

--- Comment #2 from James McCoy <jamessan at jamessan dot com> ---
My initial bisect pointed to that, but I was using the Vim test suite as the
good/bad check.

I'm rerunning now with just the minimal reproduction to double check the
results.