Create type masks lazily.

sdk/lib/_internal/compiler/implementation/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.
 
 part of dart2js;
 
 class EnqueueTask extends CompilerTask {
   final ResolutionEnqueuer resolution;
   final CodegenEnqueuer codegen;
 
@@ skipping 113 matching lines @@
     });
   }
 
   void registerInstantiatedClass(ClassElement cls, TreeElements elements) {
     cls.ensureResolved(compiler);
     registerInstantiatedType(cls.rawType, elements);
   }
 
   void registerTypeLiteral(Element element, TreeElements elements) {
     registerInstantiatedClass(compiler.typeClass, elements);
-    compiler.backend.registerTypeLiteral(element, elements);
+    compiler.backend.registerTypeLiteral(element, this, elements);
   }
 
   bool checkNoEnqueuedInvokedInstanceMethods() {
     task.measure(() {
       // Run through the classes and see if we need to compile methods.
       for (ClassElement classElement in universe.instantiatedClasses) {
         for (ClassElement currentClass = classElement;
              currentClass != null;
              currentClass = currentClass.superclass) {
           processInstantiatedClass(currentClass);
@@ skipping 580 matching lines @@
     while(!queue.isEmpty) {
       // TODO(johnniwinther): Find an optimal process order for codegen.
       f(queue.removeLast());
     }
   }
 
   void _logSpecificSummary(log(message)) {
     log('Compiled ${generatedCode.length} methods.');
   }
 }