Remove silly debug statement left in a test (for bug 848062) that breaks it in opt builds. No bug#, r=sfink on a CLOSED TREE.

js/src/jit-test/tests/arrow-functions/this-2.js

@@ -2,7 +2,6 @@
 
 var obj = {
     f: function (s) {
-        dis();
         return a => eval(s);
     }
 };