* Makefile.in (dwarf2out.o): Add dependendcy on hashtab.h.
	* dwarf2out.c: Include hashtab.h.
	(is_main_source): New static variable.
	(attr_checksum, die_checksum): Modified to handle die references.
	(same_loc_p, same_dw_val_p, same_attr_p, same_die_p, same_die_p_wrap,
	unmark_all_dies, htab_cu_hash, htab_cu_eq, htab_cu_del, check_duplicate_cu,
	record_comdat_symbol_number): New static functions.
	(output_comp_unit, compute_section_prefix, is_type_die, break_out_includes,
	mark_dies, unmark_dies, dwarf2out_start_source_file): Modified.
	* toplev.c (rest_of_decl_compilation): Call of dwarf2out_decl for type
	declarations added.

From-SVN: r58578