implement the div10 as assembler

easy after the some version worked
because it’s not arm it probably twice as long as need be
better (any?) optimisation would take care of that
still, nice to see it works

lib/register/boot.rb

@@ -156,7 +156,7 @@ module Register
       end
 
       obj = @space.get_class_by_name(:Integer)
-      [ :putint, :mod4].each do |f|   #mod4 is just a forward declaration
+      [ :putint, :mod4, :div10].each do |f|   #mod4 is just a forward declaration
         obj.add_instance_method Builtin::Integer.send(f , nil)
       end
     end