re PR fortran/50981 ([OOP] Wrong-code for scalarizing ELEMENTAL call with absent...

re PR fortran/50981 ([OOP] Wrong-code for scalarizing ELEMENTAL call with absent OPTIONAL argument)

	PR fortran/50981
	* trans-array.h (gfc_walk_elemental_function_args): New argument.
	* trans-intrinsic.c (gfc_walk_intrinsic_function): Update call.
	* trans-stmt.c (gfc_trans_call): Ditto.
	* trans-array.c (gfc_walk_function_expr): Ditto.
	(gfc_walk_elemental_function_args): Get the dummy argument list
	if possible.  Check that the dummy and the actual argument are both
	optional, and set can_be_null_ref accordingly.

	* gfortran.dg/elemental_optional_args_2.f90: New test.

From-SVN: r182875