dart2js: --fast-startup: share defaultValues property for closures with no default values

pkg/compiler/lib/src/js_emitter/model.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.new_js_emitter.model;
 
 import '../constants/values.dart' show ConstantValue;
 import '../deferred_load.dart' show OutputUnit;
 import '../elements/entities.dart';
 import '../js/js.dart' as js show Expression, Name, Statement, TokenFinalizer;
@@ skipping 212 matching lines @@
   /// Stub methods for this class that are call stubs for getters.
   final List<StubMethod> callStubs;
 
   /// noSuchMethod stubs in the special case that the class is Object.
   final List<StubMethod> noSuchMethodStubs;
   final List<Field> staticFieldsForReflection;
   final bool hasRtiField; // Per-instance runtime type information pseudo-field.
   final bool onlyForRti;
   final bool isDirectlyInstantiated;
   final bool isNative;
+  final bool isClosureBaseClass; // Common base class for closures.
 
   // If the class implements a function type, and the type is encoded in the
   // metatada table, then this field contains the index into that field.
   final js.Expression functionTypeIndex;
 
   /// Whether the class must be evaluated eagerly.
   bool isEager = false;
 
   /// Leaf tags. See [NativeEmitter.prepareNativeClasses].
   List<String> nativeLeafTags;
@@ skipping 12 matching lines @@
       this.fields,
       this.staticFieldsForReflection,
       this.callStubs,
       this.noSuchMethodStubs,
       this.checkedSetters,
       this.isChecks,
       this.functionTypeIndex,
       {this.hasRtiField,
       this.onlyForRti,
       this.isDirectlyInstantiated,
-      this.isNative}) {
+      this.isNative,
+      this.isClosureBaseClass}) {
     assert(onlyForRti != null);
     assert(isDirectlyInstantiated != null);
     assert(isNative != null);
+    assert(isClosureBaseClass != null);
   }
 
   bool get isMixinApplication => false;
   Class get superclass => _superclass;
 
   void setSuperclass(Class superclass) {
     _superclass = superclass;
   }
 
   js.Name get superclassName => superclass == null ? null : superclass.name;
@@ skipping 26 matching lines @@
             instanceFields,
             staticFieldsForReflection,
             callStubs,
             const <StubMethod>[],
             checkedSetters,
             isChecks,
             functionTypeIndex,
             hasRtiField: hasRtiField,
             onlyForRti: onlyForRti,
             isDirectlyInstantiated: isDirectlyInstantiated,
-            isNative: false);
+            isNative: false,
+            isClosureBaseClass: false);
 
   bool get isMixinApplication => true;
   Class get mixinClass => _mixinClass;
 
   void setMixinClass(Class mixinClass) {
     _mixinClass = mixinClass;
   }
 }
 
 /// A field.
@@ skipping 197 matching lines @@
             functionType: functionType);
 
   bool get isStatic => true;
 }
 
 class StaticStubMethod extends StubMethod implements StaticMethod {
   Holder holder;
   StaticStubMethod(js.Name name, this.holder, js.Expression code)
       : super(name, code);
 }