Fixing tests for implicit return

previous commit affected rather many test, as the implicit returns add extra instructions
Also added some explicit returns, so as not to test the return logic too much. return (ie return nl) is a knonwn 3 risc operation.

test/vool/class_send/helper.rb

@@ -20,7 +20,7 @@ module Vool
       assert_equal Mom::MessageSetup , @ins.class , @ins
     end
     def test_two_instructions_are_returned
-      assert_equal 6 ,  @ins.length , @ins
+      assert_equal 8 ,  @ins.length , @ins
     end
     def test_receiver_move_class
       assert_equal Mom::ArgumentTransfer,  @ins.next(1).class
@@ -38,8 +38,8 @@ module Vool
       assert_equal Parfait::CallableMethod,  @ins.next(2).method.class
     end
     def test_array
-      check_array [MessageSetup,ArgumentTransfer,SimpleCall,Label,
-                  ReturnSequence , Label] , @ins
+      check_array [MessageSetup,ArgumentTransfer,SimpleCall,SlotLoad,
+                    ReturnJump,Label, ReturnSequence , Label] , @ins
     end
   end