Create type masks lazily.

sdk/lib/_internal/compiler/implementation/compile_time_constants.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;
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
@@ skipping 469 matching lines @@
     List<Constant> createArguments(_) {
       return [constantSystem.createString(
         new DartString.literal(node.slowNameString), node)];
     }
     return makeConstructedConstant(
         node, type, compiler.symbolConstructor, createArguments);
   }
 
   Constant makeTypeConstant(Element element) {
     DartType elementType = element.computeType(compiler).asRaw();
-    compiler.backend.registerTypeLiteral(element, elements);
+    compiler.backend.registerTypeLiteral(
+        element, compiler.enqueuer.codegen, elements);
     DartType constantType =
         compiler.backend.typeImplementation.computeType(compiler);
     Constant constant = new TypeConstant(elementType, constantType);
     // If we use a type literal in a constant, the compile time
     // constant emitter will generate a call to the createRuntimeType
     // helper so we register a use of that.
     handler.registerCreateRuntimeTypeFunction();
     handler.registerCompileTimeConstant(constant, elements);
     return constant;
   }
@@ skipping 448 matching lines @@
           if (fieldValue == null) {
             // Use the default value.
             fieldValue = handler.compileConstant(field);
           }
           jsNewArguments.add(fieldValue);
         },
         includeSuperAndInjectedMembers: true);
     return jsNewArguments;
   }
 }