Fix legacy const for-of/in destructuring

test/mjsunit/harmony/destructuring.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Flags: --harmony-destructuring
 // Flags: --harmony-default-parameters --harmony-rest-parameters
 
 (function TestObjectLiteralPattern() {
   var { x : x, y : y, get, set } = { x : 1, y : 2, get: 3, set: 4 };
   assertEquals(1, x);
@@ skipping 1079 matching lines @@
   assertThrows(function(){ eval("({}) => {'use strict';}") }, SyntaxError);
   assertThrows(
     function(){ eval("(class{foo({}) {'use strict';}});") }, SyntaxError);
 
   assertThrows(
     function(){ eval("function(a, {}){'use strict';}") }, SyntaxError);
   assertThrows(function(){ eval("(a, {}) => {'use strict';}") }, SyntaxError);
   assertThrows(
     function(){ eval("(class{foo(a, {}) {'use strict';}});") }, SyntaxError);
 })();
+
+(function TestLegacyConstDestructuringInForLoop() {
+  var result;
+  for (const {foo} of [{foo: 1}]) { result = foo; }
+  assertEquals(1, result);
+})();