Avoid eager enqueueing from resolution

pkg/compiler/lib/src/dart_backend/backend.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 dart_backend;
 
 // TODO(ahe): This class is simply wrong.  This backend should use
 // elements when it can, not AST nodes.  Perhaps a [Map<Element,
 // TreeElements>] is what is needed.
 class ElementAst {
@@ skipping 165 matching lines @@
                                          element,
                                          elementAst,
                                          newTypedefElementCallback,
                                          newClassElementCallback);
       collector.collect();
     }
 
     int totalSize = outputter.assembleProgram(
         libraries: compiler.libraryLoader.libraries,
         instantiatedClasses: compiler.resolverWorld.directlyInstantiatedClasses,
-        resolvedElements: compiler.enqueuer.resolution.resolvedElements,
+        resolvedElements: compiler.enqueuer.resolution.processedElements,
         usedTypeLiterals: usedTypeLiterals,
         postProcessElementAst: postProcessElementAst,
         computeElementAst: computeElementAst,
         shouldOutput: shouldOutput,
         isSafeToRemoveTypeDeclarations: isSafeToRemoveTypeDeclarations,
         sortElements: Elements.sortedByPosition,
         mirrorRenamer: mirrorRenamer,
         mainFunction: compiler.mainFunction,
         outputUri: compiler.outputUri);
 
@@ skipping 142 matching lines @@
         node, MessageKind.DEFERRED_LIBRARY_DART_2_DART);
     return false;
   }
 }
 
 class DartResolutionCallbacks extends ResolutionCallbacks {
   final DartBackend backend;
 
   DartResolutionCallbacks(this.backend);
 
+  @override
+  WorldImpact transformImpact(ResolutionWorldImpact worldImpact) {
+    TransformedWorldImpact transformed =
+        new TransformedWorldImpact(worldImpact);
+    for (DartType typeLiteral in worldImpact.typeLiterals) {
+      onTypeLiteral(typeLiteral, transformed);
+    }
+    for (InterfaceType instantiatedType in worldImpact.instantiatedTypes) {
+      // TODO(johnniwinther): Remove this when dependency tracking is done on
+      // the world impact itself.
+      transformed.registerInstantiation(instantiatedType);
+      backend.registerInstantiatedType(
+          instantiatedType, backend.compiler.enqueuer.resolution, transformed);
+    }
+    return transformed;
+  }
+
+  @override
   void onTypeLiteral(DartType type, Registry registry) {
     if (type.isInterfaceType) {
       backend.usedTypeLiterals.add(type.element);
     }
   }
 }
 
 class EmitterUnparser extends Unparser {
   final Map<Node, String> renames;
 
@@ skipping 168 matching lines @@
   }
 
   // TODO(johnniwinther): Remove this when values are computed from the
   // expressions.
   @override
   void copyConstantValues(DartConstantTask task) {
     constantCompiler.constantValueMap.addAll(
         task.constantCompiler.constantValueMap);
   }
 }