[Patch, Fortran] PR 43199 - Handle class%component references when reading .mod files

[Tobias Burnus]

Hello,

this patch prevents an ICE when handling class%component in
find_array_spec. The problem is that with CLASS(type) one has
effectively another layer around type, i.e. kind of

TYPE class.type
   type(type) :: data

and one needs to accommodate for this extra layer. I think the attached
patch correctly handles this.

Build on x86-64-linux and currently regtesting. OK for the trunk?

Tobias

PS: I marked the test as "dg-do compile" but one can also use "run";
what do you prefer?
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