Support serialization of WorldImpact

pkg/compiler/lib/src/compiler.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.compiler_base;
 
 import 'dart:async' show
     EventSink,
     Future;
 
@@ skipping 971 matching lines @@
 
     mirrorUsageAnalyzerTask.analyzeUsage(mainApp);
 
     // In order to see if a library is deferred, we must compute the
     // compile-time constants that are metadata.  This means adding
     // something to the resolution queue.  So we cannot wait with
     // this until after the resolution queue is processed.
     deferredLoadTask.beforeResolution(this);
     impactStrategy = backend.createImpactStrategy(
         supportDeferredLoad: deferredLoadTask.isProgramSplit,
-        supportDumpInfo: dumpInfo);
+        supportDumpInfo: dumpInfo,
+        supportSerialization: true);
 
     phase = PHASE_RESOLVING;
     if (analyzeAll) {
       libraryLoader.libraries.forEach((LibraryElement library) {
       reporter.log('Enqueuing ${library.canonicalUri}');
         fullyEnqueueLibrary(library, enqueuer.resolution);
       });
     } else if (analyzeMain) {
       if (mainApp != null) {
         fullyEnqueueLibrary(mainApp, enqueuer.resolution);
@@ skipping 1213 matching lines @@
     if (_otherDependencies == null) {
       _otherDependencies = new Setlet<Element>();
     }
     _otherDependencies.add(element.implementation);
   }
 
   Iterable<Element> get otherDependencies {
     return _otherDependencies != null ? _otherDependencies : const <Element>[];
   }
 }