dwarf2out.c (die_struct): Add comdat_type_p flag.

	* dwarf2out.c (die_struct): Add comdat_type_p flag.  Use it instead of
	use_debug_types to discriminate the die_id union.
	(print_die, assign_symbol_names, copy_decls_walk): Likewise.
	(build_abbrev_table, output_die): Likewise.
	(prune_unused_types_walk_attribs): Likewise.
	(generate_type_signature, copy_declaration_context): Set it.
	(remove_child_or_replace_with_skeleton): Set it.
	(dwarf2out_start_source_file, dwarf2out_end_source_file): Don't
	check use_debug_types.
	(dwarf2out_finish): Do break_out_includes after .debug_types.

From-SVN: r187107