[Bug target/110027] Misaligned vector store on detect_stack_use_after_return

[elrodc at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110027

--- Comment #9 from Chris Elrod <elrodc at gmail dot com> ---
> Interestingly this seems to be only reproducible on Arch Linux. Other gcc 13.1.1 builds, Fedora for instance, seem to behave correctly. 

I haven't tried that reproducer on Fedora with gcc 13.2.1, which could have
regressed since 13.1.1.
However, the dup example in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114276
does reproduce on Fedora with gcc-13.2.1 once you add extra compile flags
`-std=c++23 -fstack-protector-strong`.
I'll try the original reproducer later, it may be the case that adding/removing
these flags fuzzes the alignment.