cps-ir: Support compilation of methods that use interceptor calling convention.

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 '../js_backend.dart';
 import '../../dart2jslib.dart';
 import '../../js_emitter/js_emitter.dart';
 import '../../js/js.dart' as js;
@@ skipping 194 matching lines @@
 
   bool isBoolClass(ClassElement cls) => cls == _compiler.boolClass;
 
   bool isNumClass(ClassElement cls) => cls == _compiler.numClass;
 
   bool isDoubleClass(ClassElement cls) => cls == _compiler.doubleClass;
 
   String getTypeTestTag(DartType type) {
     return _backend.namer.operatorIsType(type);
   }
+
+  bool operatorEqHandlesNullArgument(FunctionElement element) {
+    return _backend.operatorEqHandlesNullArgument(element);
+  }
 }