2017-06-21  Eric Christopher  <echristo@gmail.com>
    
            Apply from master
           	2017-06-20  Eric Christopher  <echristo@gmail.com>
    
            * aarch64.cc (scan_reloc_for_stub): Use plt_address_for_global to
            calculate the symbol value.
            (scan_reloc_section_for_stubs): Allow stubs to be created for
            section symbols.
            (maybe_apply_stub): Handle creating stubs for weak symbols to
            match the code in scan_reloc_for_stub.