[Patch, Fortran, committed] PR58652, fix CLASS(*) handling in MOVE_ALLOC

[Tobias Burnus]

The reason for the failure was that UNLIMITED_POLY (from_expr) is no 
longer true after one did a gfc_add_vptr_component (from_expr);
As vtab is only NULL for unlimited polymorphic [CLASS(*)], I use it now 
instead.

Build and regtested on x86-64-gnu-linux.
Committed as Rev. 203586.

Tobias

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