* gcc-interface/ada-tree.h (DECL_BY_DOUBLE_REF_P): New macro.
	* gcc-interface/gigi.h (annotate_object): Add BY_DOUBLE_REF parameter.
	* gcc-interface/decl.c (annotate_object): Likewise and handle it.
	(gnat_to_gnu_entity): Adjust calls to annotate_object.
	(gnat_to_gnu_param): If fat pointer types are passed by reference on
	the target, pass them by explicit reference.
	* gcc-interface/misc.c (default_pass_by_ref): Fix type of constant.
	* gcc-interface/trans.c (Identifier_to_gnu): Do DECL_BY_DOUBLE_REF_P.
	(Subprogram_Body_to_gnu): Adjust call to annotate_object.
	(call_to_gnu): Handle DECL_BY_DOUBLE_REF_P.
	* gcc-interface/utils.c (convert_vms_descriptor): Add BY_REF parameter
	and handle it.
	(build_function_stub): Iterate on the parameters of the subprogram in
	lieu of on the argument types.  Adjust call to convert_vms_descriptor.

From-SVN: r165250