[Patch, Fortran] PR58436 - Fix a CLASS(*) finalization bug

[Tobias Burnus]

I forgot, again, to attach the patch.

However, to my surprise the email made it through. Contrary to Janus' 
second patch review of today which didn't went past GCC's mail server. 
(The same problem I had yesterday: Three emails didn't make it.)

Tobias Burnus wrote:
> There were two related issues with the _vtab of CLASS(*): First, it 
> was crashing in the generation of the finalization wrapper. Secondly, 
> one needs to ensure that the _vtab contains a NULL pointer for _final.
>
> Build and regtested on x86-64-gnu-linux.
> OK for the trunk?
>
> Tobias
>
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