fix mod4 name

really did div4

test/vool/to_mom/send/test_send_cached_simple.rb

@@ -7,7 +7,7 @@ module Vool
 
     def setup
       Risc.machine.boot
-      @ins = compile_first_method( "a = 5; a.mod4")
+      @ins = compile_first_method( "a = 5; a.div4")
     end
     def test_check_type
       assert_equal NotSameCheck , @ins.next.class , @ins

test/vool/to_mom/send/test_send_simple.rb

@@ -8,13 +8,13 @@ module Vool
 
     def setup
       Risc.machine.boot
-      @ins = compile_first_method( "5.mod4")
+      @ins = compile_first_method( "5.div4")
     end
     def receiver
       [Mom::IntegerConstant , 5]
     end
     def test_call_has_right_method
-      assert_equal :mod4,  @ins.next(2).method.name
+      assert_equal :div4,  @ins.next(2).method.name
     end
 
   end

test/vool/to_mom/send/test_send_simple_args.rb

@@ -8,7 +8,7 @@ module Vool
 
     def setup
       Risc.machine.boot
-      @ins = compile_first_method( "5.mod4(1,2)")
+      @ins = compile_first_method( "5.div4(1,2)")
     end
 
     def receiver