[Bug sanitizer/70147] testcase from hana testsuite gets miscompiled with -fsanitize=undefined

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70147

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
-fsanitize=vptr is enough.