make ints compile time mutable

to change the label value and use the allocated stubs

lib/mom/instruction/label.rb

@@ -1,6 +1,6 @@
 module Mom
 
-  # A Label is the only legal target for a branch (this is true in Mom and Risc)
+  # A Label is the only legal target for a branch (in Mom, in Risc a BinaryCode is ok too)
   #
   # In the dynamic view (runtime) where the instructions form a graph,
   # branches fan out, Labels collect. In other words a branch is the place where
@@ -31,6 +31,7 @@ module Mom
     # Off course some specific place still has to be responsible for actually
     # adding the label to the instruction list (usually an if/while)
     def to_risc(compiler)
+      
       @risc_label ||= Risc::Label.new(self,name)
     end
   end