adds a return jump

that will be used to jump to the return sequence

lib/mom/instruction/instruction.rb

@@ -37,6 +37,7 @@ require_relative "resolve_method"
 require_relative "truth_check"
 require_relative "not_same_check"
 require_relative "jump"
+require_relative "return_jump"
 require_relative "slot_load"
 require_relative "return_sequence"
 require_relative "message_setup"

lib/mom/instruction/return_jump.rb

@@ -0,0 +1,16 @@
+module Mom
+
+  # the return jump jumps to the return label
+  # the method setup is such that there is exactly one return_label in a method
+  # This is so the actual code that executes the return can be quite complicated
+  # and big, and won't be repeated
+  #
+  class ReturnJump < Instruction
+
+    def to_risc(compiler)
+      Risc::Branch.new(self , compiler.return_label)
+    end
+  end
+
+
+end