* config/obj-elf.c (obj_elf_type): Add code to support a type of
            gnu_unique_object.
            * doc/as.texinfo: Document new feature of .type directive.
            * NEWS: Mention support for gnu_unique_object symbol type.
    
            * common.h (STB_GNU_UNIQUE): Define.
    
            * NEWS: Mention the linker's support for symbols with a binding of
            STB_GNU_UNIQUE.
    
            * gas/elf/type.s: Add unique global symbol definition.
            * gas/elf/type.e: Add expected readelf output for global unique
            symbol.
    
            * elfcpp.h (enum STB): Add STB_GNU_UNIQUE.
    
            * readelf.c (get_symbol_binding): For Linux targeted files return
            UNIQUE for symbols with the STB_GNU_UNIQUE binding.
            * doc/binutils.texi: Document the meaning of the 'u' symbol
            binding in the output of nm and objdump --syms.
    
            * elf-bfd.h (struct elf_link_hash_entry): Add unique_global field.
            * elf.c (swap_out_syms): Set binding to STB_GNU_UNIQUE for symbols
            with the BSF_GNU_UNIQUE flag bit set.
            * elfcode.h (elf_slurp_symbol_table): Set the BSF_GNU_UNIQUE flag
            for symbols with STB_GNU_UNIQUE binding.
            * elflink.c (_bfd_elf_merge_symbol): Set unique_global for symbols
            with the STB_GNU_UNIQUE binding.
            (elf_link_add_object_symbols): Set the BSF_GNU_UNIQUE flag for
            symbols with STB_GNU_UNIQUE binding.  Set STB_GNU_UNIQUE for
            symbols with the unique_global field set.
            (elf_link_output_extsym): Set unique_global field for symbols with
            the STB_GNU_UNIQUE binding.
            * syms.c (struct bfd_symbol): Define BSF_GNU_UNIQUE flag bit.
            (bfd_print_symbol_vandf): Print a 'u' character for BSF_GNU_UNIQUE
            symbols.
            (bfd_decode_symclass): Return a 'u' character for BSF_GNU_UNIQUE
            symbols.
            * bfd-in2.h: Regenerate.