[Bug middle-end/85164] poly-int.h:845:5: runtime error: signed integer overflow

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85164

--- Comment #17 from Martin Liška <marxin at gcc dot gnu.org> ---
> Could you open separate PRs for the new tests?  We could perhaps
> have a meta-bug for ubsan failures too, if we don't already.

I did so: PR90213 and PR90214.