Revert "Move towards using WorldImpact for codegen"

pkg/compiler/lib/src/common/registry.dart

Index: pkg/compiler/lib/src/common/registry.dart
diff --git a/pkg/compiler/lib/src/common/registry.dart b/pkg/compiler/lib/src/common/registry.dart
index 08d6081c5d850e8e5c6cad0e8b9b3288e662b6b0..96ee8453d6bd057247cf62e9c6aa29dcd92fba51 100644
--- a/pkg/compiler/lib/src/common/registry.dart
+++ b/pkg/compiler/lib/src/common/registry.dart
@@ -4,10 +4,48 @@
 
 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;
 
-// TODO(johnniwinther): Remove this.
 /// 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.
+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;
 }