large test changes due to change in cc

calling convention does affect
less than before, but still a LOT

test/mom/instruction/test_return_sequence.rb

@@ -10,8 +10,8 @@ module Risc
       @expect = "something"
       @produced = produce_instructions
     end
-    def instruction(num) # 24 is the main, see test/mom/send/test_setup_simple.rb
-      @produced.next( 24 + num)
+    def instruction(num) # 18 is the main, see length in test/mom/send/test_setup_simple.rb
+      @produced.next( 18 + num)
     end
     def test_postamble_classes
       postamble.each_with_index do |ins , index|