add traceable dummies

lib/mom/instruction/jump.rb

@@ -1,13 +1,16 @@
 module Mom
 
   # unconditional jump to the instruction given as target
-  # 
+  #
   class Jump < Instruction
     attr_reader :target
 
     def initialize(target)
       @target = target
     end
+    def to_risc(context)
+      Risc::Label.new(self,"Jump")
+    end
   end