[PATCH, comitted] Fix memory leak found in pdt_86.f03 [PR121972]

Pushed after full testing. Fairly obvious

Thanks Paul

Regards,

Jerry


commit 1a2de01fbac64f97fed6f63ff655b13bff831877 (HEAD -> master, origin/master, 
origin/HEAD)
Author: Paul Thomas <[email protected]>
Date:   Tue Jun 30 10:39:57 2026 +0100

     Fortran: Fix memory leak found in pdt_86.f03 [PR121972]

     Followup on memory leaks found using -fsanitize=address
     in existing test cases.

     Co-authored-by: Jerry DeLisle <[email protected]>

             PR fortran/121972

     gcc/fortran/

             * decl.cc (gfc_get_pdt_instance): A PDT that has a derived type
             component, which has allocatable components, must be marked as
             having allocatable components.
             * resolve.cc (gfc_resolve_ref): Initialize last_pdt from the base
             symbol's declared type when the expression type is not a PDT.

     gcc/testsuite/

             * gfortran.dg/pdt_86.f03: Add tree dump for counts of frees and
             mallocs (41 & 31 respectively).
             * gfortran.dg/pdt_86_reduced.f90: New test to check that the
             non-PDT version of the leak has gone.