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

[Jerry D]

Pushed after full testing. Fairly obvious

Thanks Paul
Regards,

Jerry


commit 1a2de01fbac64f97fed6f63ff655b13bff831877 (HEAD -> master, origin/master, 
origin/HEAD)
Author: Paul Thomas <pa...@gcc.gnu.org>
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 <jvdeli...@gcc.gnu.org>

            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.