Extract the AST specific part of NoSuchMethodRegistry

pkg/compiler/lib/src/js_backend/backend_helpers.dart

 // Copyright (c) 2015, 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.js_backend.helpers;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers, Uris;
 import '../common_elements.dart' show CommonElements, ElementEnvironment;
 import '../elements/elements.dart' show PublicName;
@@ skipping 727 matching lines @@
       _findHelperFunction('convertRtiToRuntimeType');
 
   ClassEntity get stackTraceClass => _findHelperClass('_StackTrace');
 
   FunctionEntity _objectNoSuchMethod;
   FunctionEntity get objectNoSuchMethod {
     return _objectNoSuchMethod ??= _env.lookupClassMember(
         commonElements.objectClass, Identifiers.noSuchMethod_);
   }
 
+  bool isDefaultNoSuchMethodImplementation(FunctionEntity element) {
+    ClassEntity classElement = element.enclosingClass;
+    return classElement == commonElements.objectClass ||
+        classElement == jsInterceptorClass ||
+        classElement == jsNullClass;
+  }
+
   ClassEntity get constantMapClass =>
       _findHelperClass(JavaScriptMapConstant.DART_CLASS);
   ClassEntity get constantStringMapClass =>
       _findHelperClass(JavaScriptMapConstant.DART_STRING_CLASS);
   ClassEntity get constantProtoMapClass =>
       _findHelperClass(JavaScriptMapConstant.DART_PROTO_CLASS);
   ClassEntity get generalConstantMapClass =>
       _findHelperClass(JavaScriptMapConstant.DART_GENERAL_CLASS);
 
   ClassEntity get annotationCreatesClass => _findHelperClass('Creates');
@@ skipping 13 matching lines @@
   /// The class for patch annotations defined in dart:_js_helper.
   ClassEntity get patchAnnotationClass =>
       _patchAnnotationClass ??= _findHelperClass('_Patch');
 
   ClassEntity _nativeAnnotationClass;
 
   /// The class for native annotations defined in dart:_js_helper.
   ClassEntity get nativeAnnotationClass =>
       _nativeAnnotationClass ??= _findHelperClass('Native');
 }