Compensate for the lack of code motion in licm.

tests/compiler/dart2js/licm_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.
+
+// Check that we hoist instructions in a loop condition, even if that
+// condition involves control flow.
+
+import 'package:expect/expect.dart';
+
+import 'compiler_helper.dart';
+
+const String TEST = '''
+var a = [1];
+
+main() {
+  int count = int.parse('42') == 42 ? 42 : null;
+  for (int i = 0; i < count && i < a[0]; i++) {
+    print(i);
+  }
+  a.removeLast();
+  // Ensure we don't try to generate a bailout method based on a check
+  // of [count].
+  count.removeLast();
+}
+''';
+
+main() {
+  compileAndMatch(
+      TEST, 'main', new RegExp("if \\(count == null\\)(.|\\n)*while"));
+}