Introduce "CommonElements"

pkg/compiler/lib/src/enqueue.dart

 // Copyright (c) 2012, 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.enqueue;
 
 import 'dart:collection' show Queue;
 
 import 'common/codegen.dart' show CodegenWorkItem;
 import 'common/names.dart' show Identifiers;
@@ skipping 758 matching lines @@
     }
 
     if (element.isGetter && element.name == Identifiers.runtimeType_) {
       // Enable runtime type support if we discover a getter called runtimeType.
       // We have to enable runtime type before hitting the codegen, so
       // that constructors know whether they need to generate code for
       // runtime type.
       compiler.enabledRuntimeType = true;
       // TODO(ahe): Record precise dependency here.
       compiler.backend.registerRuntimeType(this, compiler.globalDependencies);
-    } else if (element == compiler.functionApplyMethod) {
+    } else if (compiler.commonElements.isFunctionApplyMethod(element)) {
       compiler.enabledFunctionApply = true;
     }
 
     return true;
   }
 
   void registerNoSuchMethod(Element element) {
     compiler.backend.registerNoSuchMethod(element);
   }
 
@@ skipping 227 matching lines @@
 }
 
 typedef void _DeferredActionFunction();
 
 class _DeferredAction {
   final Element element;
   final _DeferredActionFunction action;
 
   _DeferredAction(this.element, this.action);
 }