[Bug sanitizer/87095] [8/9 Regression] UndefinedBehaviorSanitizer vptr false positive with virtual inheritance only with -fno-sanitize-recover

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87095

--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Jakub's patch looks right to me.  Take this as post-test approval.