[Bug libstdc++/61519] Seemingly incorrect vtable reference when libstdc++ built with RTTI

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61519

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Surely this is a target-specific bug in the dynamic_cast implementation, not
libstdc++?