* elflink.c (_bfd_elf_define_linkage_sym): Don't call

	bfd_elf_link_record_dynamic_symbol.  Call elf_backend_hide_symbol.
	(_bfd_elf_link_renumber_dynsyms): Formatting.
	(struct elf_gc_sweep_symbol_info): New.
	(elf_gc_sweep_symbol): Rewrite.
	(elf_gc_sweep): Adjust params and elf_gc_sweep_symbol call.
	Call _bfd_elf_link_renumber_dynsyms.
	(bfd_elf_gc_sections): Adjust elf_gc_sweep call.