[Bug c++/95428] ABI breakage for "base object constructor" for final classes

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95428

--- Comment #7 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Richard Smith thinks the ABI is clear and compilers should always emit the
as-base ctor.  Even though that wording was written before final was a thing.

Depends if Jason wants to argue the case?