add seperate builders

remove if with polymorphism for different builders
(easier to understand by naming)

lib/mom/instruction/message_setup.rb

@@ -27,7 +27,7 @@ module Mom
     # Move method name, frame and arguemnt types from the method to the next_message
     # Get the message from Space and link it.
     def to_risc(compiler)
-      builder = compiler.builder(false, self)
+      builder = compiler.code_builder(self)
       build_with(builder)
     end