Fix capturing of for-loop variables

tests/language/src/FunctionTest.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Tests function statements and expressions.
 
 class Bug4089219 {
   int x;
   var f;
 
@@ skipping 193 matching lines @@
     x:for (int i = 0; i < 10; i++) {
       a.add(() {return i;});
       continue x;
     }
 
     var sum = 0;
     for (int i = 0; i < a.length; i++) {
       sum += (a[i])();
     }
 
-    Expect.equals(100, sum);
+    Expect.equals(45, sum);
   }
 
   int tempField;
 
   // Validate that a closure that calls the private name of a function (for
   // for recursion) calls the version of function with the bound names.
   void testRecursiveClosureRef() {
     tempField = 2;
     var x = 3;
     var g = f(a) {
@@ skipping 124 matching lines @@
     fooIntString = foo;
 
     uf = uf2;
     uf2 = uf;
   }
 }
 
 main() {
   FunctionTest.testMain();
 }