dart2js cps: Fix for tear-off of noSuchMethod or toString on null.

pkg/compiler/lib/src/cps_ir/optimizers.dart

 // Copyright (c) 2014, 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.
 
 library dart2js.cps_ir.optimizers;
 
 import 'cps_ir_nodes.dart';
 import '../constants/values.dart';
 import '../common/names.dart';
 import '../universe/selector.dart';
@@ skipping 36 matching lines @@
 }
 
 /// Returns true if [value] satisfies a branching condition with the
 /// given strictness.
 ///
 /// For non-strict, this is the opposite of [isFalsyConstant].
 bool isTruthyConstant(ConstantValue value, {bool strict: false}) {
   return strict ? value.isTrue : !isFalsyConstant(value);
 }
 
-/// Selector that do not throw when invoked on the null class.
+/// Selectors that do not throw when invoked on the null value.
 final List<Selector> selectorsOnNull = <Selector>[
     Selectors.equals, Selectors.hashCode_, Selectors.runtimeType_,
-    Selectors.toString_];
+    Selectors.toString_, Selectors.toStringGetter,
+    Selectors.noSuchMethodGetter];