Use entities in BackendClasses

pkg/compiler/lib/src/js_backend/backend_impact.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_helpers.impact;
 
 import '../common/names.dart';
 import '../compiler.dart' show Compiler;
 import '../core_types.dart' show CommonElements;
 import '../elements/resolution_types.dart' show ResolutionInterfaceType;
@@ skipping 379 matching lines @@
 
   BackendImpact get lazyField {
     return _lazyField ??=
         new BackendImpact(staticUses: [helpers.cyclicThrowHelper]);
   }
 
   BackendImpact _typeLiteral;
 
   BackendImpact get typeLiteral {
     return _typeLiteral ??= new BackendImpact(
-        instantiatedClasses: [backend.backendClasses.typeImplementation],
+        instantiatedClasses: [backend.backendClasses.typeClass],
         staticUses: [helpers.createRuntimeType]);
   }
 
   BackendImpact _stackTraceInCatch;
 
   BackendImpact get stackTraceInCatch {
     return _stackTraceInCatch ??= new BackendImpact(
         instantiatedClasses: [helpers.stackTraceClass],
         staticUses: [helpers.traceFromException]);
   }
@@ skipping 318 matching lines @@
 
   BackendImpact _staticClosure;
 
   /// Backend impact for performing closurization of a top-level or static
   /// function.
   BackendImpact get staticClosure {
     return _staticClosure ??=
         new BackendImpact(globalClasses: [helpers.closureClass]);
   }
 }