[Patch, fortran] PR80477 - [OOP] Polymorphic function result generates memory leak

[Paul Richard Thomas]

Several attempts, including mine, were made to fix this bug since it
was posted. They were all attacking the wrong place. Instead of
providing the free of the class _data as part of the call to
'add_a_type' it should be included in the post block of the argument
processing in the call to 'assign_a_type'. The comment in the patch
says the rest.

Bootstrapped and regtested on FC28/x86_64 - OK for trunk?

Paul

2017-07-27  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/80477
    * trans-expr.c (gfc_conv_procedure_call): Allocatable class
    results being passed to a derived type formal argument must
    have the _data component deallocated after use.

2017-07-27  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/80477
    * gfortran.dg/class_result_7.f90: New test.
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