[Patch, fortran] PR110012 - [PDT] ICE involving parametrized polymorphic variable

[Paul Richard Thomas]

Hi All,

The attached is a straightforward fix for a problem with PDT class
components of a non parameterised derived type. The ICE is fixed by finding
the PDT instance and building the class type just before the ICE occurred
(gcc_assert (vtab);).

Note that, in common with a number of other PDT testcases, the allocation
in line 22 of the submitted test loses memory (PR121972). I will be turning
to this soon.

Regtests on FC43/x86_64. OK for mainline?

Regards

Paul
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