derive binary code form word

long ago hacked the binary code to use integers (thus forsaking correct
arm binaries)
Finally fix by deriving from Word which now has correct binary access
Dumped binary.name in the process, that is available from the method

lib/elf/object_writer.rb

@@ -30,14 +30,17 @@ module Elf
       end
 
       Register.machine.objects.each do |id,slot|
+        next if slot.is_a?(Parfait::BinaryCode)
         if( slot.respond_to? :sof_reference_name )
           label = "#{slot.sof_reference_name}"
         else
           label = "#{slot.class.name}::#{slot.position.to_s(16)}"
         end
         label += "=#{slot}" if slot.is_a?(Symbol) or slot.is_a?(String)
-        label += "=#{slot.name}" if slot.is_a?(Parfait::BinaryCode)
         add_symbol  label , slot.position
+        if slot.is_a?(Parfait::Method)
+          add_symbol  slot.name.to_s , slot.binary.position
+        end
       end
     end
     attr_reader :text