* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Record_Subtype>: Try to
	make a packable type for fields of union types as well.
	<is_type>: Use RECORD_OR_UNION_TYPE_P predicate.
	(gnat_to_gnu_component_type): Try to make a packable type for fields
	of union types as well.
	(make_packable_type): Use RECORD_OR_UNION_TYPE_P predicate.
	(maybe_pad_type): Try to make a packable type for fields of union types
	as well.
	(gnat_to_gnu_field): Likewise.
	(is_variable_size): Use RECORD_OR_UNION_TYPE_P predicate.
	(set_rm_size): Likewise.
	(rm_size): Likewise.
	* gcc-interface/misc.c (gnat_type_max_size): Likewise.
	* gcc-interface/trans.c (add_decl_expr): Likewise.
	* gcc-interface/utils.c (finish_record_type): Likewise.
	* gcc-interface/utils2.c (build_simple_component_ref): Likewise.

From-SVN: r180540