Revert "Move towards using WorldImpact for codegen"

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

Index: pkg/compiler/lib/src/common/codegen.dart
diff --git a/pkg/compiler/lib/src/common/codegen.dart b/pkg/compiler/lib/src/common/codegen.dart
index 521458560a80630bb795bf916284796d40deed1d..84eb4222d70511e2e73b6c6a618c9d573ef4238f 100644
--- a/pkg/compiler/lib/src/common/codegen.dart
+++ b/pkg/compiler/lib/src/common/codegen.dart
@@ -19,14 +19,17 @@ import '../elements/elements.dart'
 import '../enqueue.dart' show Enqueuer;
 import '../universe/use.dart' show DynamicUse, StaticUse, TypeUse;
 import '../universe/world_impact.dart'
-    show WorldImpact, WorldImpactBuilderImpl, WorldImpactVisitor;
+    show WorldImpact, WorldImpactBuilder, WorldImpactVisitor;
 import '../util/util.dart' show Pair, Setlet;
-import 'registry.dart' show Registry;
+import 'registry.dart' show Registry, EagerRegistry;
 import 'work.dart' show WorkItem;
 
 class CodegenImpact extends WorldImpact {
   const CodegenImpact();
 
+  // TODO(johnniwinther): Remove this.
+  Registry get registry => null;
+
   Iterable<ConstantValue> get compileTimeConstants => const <ConstantValue>[];
 
   Iterable<Pair<DartType, DartType>> get typeVariableBoundsSubtypeChecks {
@@ -46,7 +49,10 @@ class CodegenImpact extends WorldImpact {
   Iterable<Element> get asyncMarkers => const <FunctionElement>[];
 }
 
-class _CodegenImpact extends WorldImpactBuilderImpl implements CodegenImpact {
+class _CodegenImpact extends WorldImpactBuilder implements CodegenImpact {
+  // TODO(johnniwinther): Remove this.
+  final Registry registry;
+
   Setlet<ConstantValue> _compileTimeConstants;
   Setlet<Pair<DartType, DartType>> _typeVariableBoundsSubtypeChecks;
   Setlet<String> _constSymbols;
@@ -55,7 +61,7 @@ class _CodegenImpact extends WorldImpactBuilderImpl implements CodegenImpact {
   Setlet<ClassElement> _typeConstants;
   Setlet<FunctionElement> _asyncMarkers;
 
-  _CodegenImpact();
+  _CodegenImpact(this.registry);
 
   void apply(WorldImpactVisitor visitor) {
     staticUses.forEach(visitor.visitStaticUse);
@@ -154,7 +160,8 @@ class CodegenRegistry extends Registry {
   CodegenRegistry(Compiler compiler, AstElement currentElement)
       : this.compiler = compiler,
         this.currentElement = currentElement,
-        this.worldImpact = new _CodegenImpact();
+        this.worldImpact = new _CodegenImpact(new EagerRegistry(
+            'EagerRegistry for $currentElement', compiler.enqueuer.codegen));
 
   bool get isForResolution => false;