Revert "Move towards using WorldImpact for codegen"

pkg/compiler/lib/src/common/registry.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.
 
 library dart2js.common.registry;
 
+import '../dart_types.dart' show InterfaceType;
 import '../elements/elements.dart' show Element;
+import '../enqueue.dart' show Enqueuer;
+import '../universe/use.dart' show DynamicUse, StaticUse;
+
+/// Interface for registration of element dependencies.
+abstract class Registry {
+  // TODO(johnniwinther): Remove this.
+  void registerDependency(Element element) {}
+
+  bool get isForResolution;
+
+  void registerDynamicUse(DynamicUse staticUse);
+
+  void registerStaticUse(StaticUse staticUse);
+
+  void registerInstantiation(InterfaceType type);
+}
 
 // TODO(johnniwinther): Remove this.
-/// Interface for registration of element dependencies.
-abstract class Registry {
-  void registerDependency(Element element) {}
+class EagerRegistry extends Registry {
+  final String name;
+  final Enqueuer world;
+
+  EagerRegistry(this.name, this.world);
+
+  bool get isForResolution => world.isResolutionQueue;
+
+  @override
+  void registerDynamicUse(DynamicUse dynamicUse) {
+    world.registerDynamicUse(dynamicUse);
+  }
+
+  @override
+  void registerInstantiation(InterfaceType type) {
+    world.registerInstantiatedType(type);
+  }
+
+  @override
+  void registerStaticUse(StaticUse staticUse) {
+    world.registerStaticUse(staticUse);
+  }
+
+  String toString() => name;
 }