Migrate block 43.

tests/language/bailout6_test.dart

-// Copyright (c) 2013, 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:expect/expect.dart";
-
-// Test for dart2js to make sure the computed bailout environment is
-// correct.
-
-var global;
-
-class A {
-  var array;
-
-  foo() {
-    do {
-      var element = global;
-      if (element is Map) continue;
-      if (element is num) break;
-    } while (true);
-    return array[0]; // bailout here.
-  }
-}
-
-void main() {
-  var a = new A();
-  a.array = [42];
-  global = 42;
-
-  for (int i = 0; i < 2; i++) {
-    Expect.equals(42, a.foo());
-  }
-
-  a.array = new Map();
-  a.array[0] = 42;
-  for (int i = 0; i < 2; i++) {
-    Expect.equals(42, a.foo());
-  }
-  global = null;
-}