daily update
gold/
    	* dwp.cc (File_list): New typedef.
    	(Dwo_name_info_reader): New class.
    	(Dwo_id_info_reader::Dwo_id_info_reader): Remove unused parameters.
    	(Dwo_id_info_reader::visit_top_die): Remove unused member function.
    	(Dwo_file::~Dwo_file): Delete input_file_ after obj_.
    	(Dwo_file::read_executable): New function.
    	(Dwo_file::read): Move common setup code to ...
    	(Dwo_file::make_object): ... here.
    	(dwp_options): Add --exec/-e.
    	(usage): Likewise.
    	(main): Likewise.