Enable ES6 iteration by default

test/mjsunit/es6/iteration-semantics.js

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-// Flags: --harmony-iteration
 // Flags: --harmony-generators --harmony-scoping --harmony-proxies
 
 // Test for-of semantics.
 
 "use strict";
 
 
 // First, some helpers.
 
 function* values() {
@@ skipping 289 matching lines @@
       if (name == 'next' && n-- < 0) throw "unreachable";
       return iterator[name];
     },
     // Needed for integers_until(10)'s this.n++.
     set: function(receiver, name, val) {
       return iterator[name] = val;
     }
   }));
 }
 assertEquals(45, fold(sum, 0, poison_proxy_after(integers_until(10), 10)));