[Patch, Fortran, OOP] PR 50919: Don't use vtable for NON_OVERRIDABLE TBP

[Janus Weil]

> Thus, I believe it is rather difficult to run into the ABI issue in the real
> world (due to technical but also due to usage reasons), but it is possible.
> Hence, I wanted to point out that there is an ABI issue, but I also don't
> oppose the committal as it is difficult to encounter the issue - both in
> practise but also with an constructed example.

Thanks for the feedback, everyone. Since we all seem to agree more or
less that the whole patch is ok for trunk, I'll commit tonight (if no
further protests appear).

Cheers,
Janus