Fortran: Fix memory problems with assumed rank formal args [PR98342].

Fortran: Fix memory problems with assumed rank formal args [PR98342].

2021-02-24  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
	PR fortran/98342
	* trans-expr.c (gfc_conv_derived_to_class): Add optional arg.
	'derived_array' to hold the fixed, parmse expr in the case of
	assumed rank formal arguments. Deal with optional arguments.
	(gfc_conv_procedure_call): Null 'derived' array for each actual
	argument. Add its address to the call to gfc_conv_derived_to_
	class. Access the 'data' field of scalar descriptors before
	deallocating allocatable components. Also strip NOPs before the
	calls to gfc_deallocate_alloc_comp. Use 'derived' array as the
	input to gfc_deallocate_alloc_comp if it is available.
	* trans.h : Include the optional argument 'derived_array' to
	the prototype of gfc_conv_derived_to_class. The default value
	is NULL_TREE.

gcc/testsuite/
	PR fortran/98342
	* gfortran.dg/assumed_rank_21.f90 : New test.