Add ElementCodegenWorldBuilder

pkg/compiler/lib/src/js_emitter/type_test_registry.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.js_emitter.type_test_registry;
 
 import '../common.dart';
 import '../common_elements.dart';
 import '../elements/elements.dart'
-    show ClassElement, Element, ElementKind, MemberElement, MethodElement;
+    show ClassElement, ElementKind, MemberElement, MethodElement;
 import '../elements/entities.dart';
 import '../elements/resolution_types.dart'
     show
         ResolutionDartType,
         ResolutionFunctionType,
         ResolutionInterfaceType,
         Types,
         ResolutionTypeVariableType;
 import '../elements/types.dart';
 import '../js_backend/runtime_types.dart'
@@ skipping 110 matching lines @@
 
     // 3.  Add classes that contain checked generic function types. These are
     //     needed to store the signature encoding.
     for (ResolutionFunctionType type in checkedFunctionTypes) {
       ClassElement contextClass = Types.getClassContext(type);
       if (contextClass != null) {
         _rtiNeededClasses.add(contextClass);
       }
     }
 
-    bool canTearOff(Element function) {
+    bool canTearOff(MemberElement function) {
       if (!function.isFunction ||
           function.isConstructor ||
           function.isAccessor) {
         return false;
       } else if (function.isInstanceMember) {
         if (!function.enclosingClass.isClosure) {
           return _codegenWorldBuilder.hasInvokedGetter(function, _closedWorld);
         }
       }
       return false;
@@ skipping 37 matching lines @@
     checkedFunctionTypes = new Set<ResolutionFunctionType>();
     _codegenWorldBuilder.isChecks.forEach((ResolutionDartType t) {
       if (t is ResolutionInterfaceType) {
         checkedClasses.add(t.element);
       } else if (t is ResolutionFunctionType) {
         checkedFunctionTypes.add(t);
       }
     });
   }
 }