Fix labeled break statements.

tests/compiler/dart2js/kernel/loops_test.dart

 // Copyright (c) 2016, 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.
 
 import 'package:test/test.dart';
 
 import 'helper.dart' show check;
 
 main() {
   test('for loop', () {
@@ skipping 66 matching lines @@
 var a = 0;
 main() {
   var sum = 0;
   for (a in [1, 2, 3]) {
     sum += a;
   }
   return sum;
 }''';
     return check(code, disableTypeInference: false);
   });
+
+  test('for loop with break to label', () {
+    String code = '''
+var a = 0;
+main() {
+  var sum = 0;
+  outer: for (a in [1, 2, 3]) {
+    for (int i = 0; i < 10; i++) {
+      sum += a;
+      if (a + i < 5)
+        break outer;
+    }
+  }
+  return sum;
+}''';
+    return check(code, disableTypeInference: false);
+  });
 }