dart2js cps: Use oneshot interceptors and 'instanceof' expressions.

pkg/compiler/lib/src/js_backend/codegen/glue.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 code_generator_dependencies;
 
 import '../backend_helpers.dart' show
     BackendHelpers;
 import '../js_backend.dart';
 
@@ skipping 274 matching lines @@
 
   ConstantValue getDefaultParameterValue(ParameterElement elem) {
     return _backend.constants.getConstantValueForVariable(elem);
   }
 
   TypeMask extendMaskIfReachesAll(Selector selector, TypeMask mask) {
     return _compiler.world.extendMaskIfReachesAll(selector, mask);
   }
 
   FunctionElement get closureFromTearOff => _backend.helpers.closureFromTearOff;
+
+  js.Name registerOneShotInterceptor(Selector selector) {
+    return _backend.registerOneShotInterceptor(selector);
+  }
+
+  bool mayGenerateInstanceofCheck(DartType type) {
+    return _backend.mayGenerateInstanceofCheck(type);
+  }
 }