gold/

gold/
	* i386.cc (Target_i386): Remove unused member dynbss_.
	* arm.cc (Target_arm): Likewise.
	* powerpc.cc (Target_powerpc): Likewise.
	* sparc.cc (Target_sparc): Likewise.
	* tilegx.cc (Target_tilegx): Likewise.
	* x86_64.cc (Target_x86_64): Likewise.
	* dwarf_reader.h (Dwarf_info_reader): Remove unused members
	type_signature_, type_offset_.
	* plugin.h (Plugin_hook): Remove unused member layout_.
	* readsyms.h (Add_symbols): Remove unused members dirpath_, dirindex_,
	mapfile_.
	(Read_member): Remove unused members input_objects_, symtab_,
	mapfile_, layout_.
	(Check_library): Remove unused member symtab_.
	* archive.h (Lib_group): Remove unused member lib_.
	* archive.cc (Lib_group::Lib_group): Update initializer.
	* incremental.h	(Incremental_binary): Remove unused member target_.
	(Incremental_script_entry): Removed unused member script_.
	* layout.h (Write_symbols_task): Remove unused member input_objects_.
	* icf.h (Icf): Remove unused member num_tracked_relocs.