Fix orange from bug 509733 changes. r=lumpy

js/src/trace-test/tests/arguments/args8.js

@@ -1,5 +1,5 @@
 actual = '';
-expected = '[object Object],[object Object],[object Object],[object Object],[object Object],';
+expected = '[object Arguments],[object Arguments],[object Arguments],[object Arguments],[object Arguments],';
 
 function h() {
   return arguments;

js/src/trace-test/tests/arguments/argsx-4.js

@@ -1,5 +1,5 @@
 actual = '';
-expected = '[object Object] undefined undefined,[object Object] undefined undefined,';
+expected = '[object Arguments] undefined undefined,[object Arguments] undefined undefined,';
 
 function f() {
   g(arguments);