Remove requiredTypes

pkg/compiler/lib/src/enqueue.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.enqueue;
 
 import 'dart:collection' show
     Queue;
 
 import 'common.dart';
@@ skipping 153 matching lines @@
     worldImpact.dynamicInvocations.forEach(registerDynamicInvocation);
     worldImpact.dynamicGetters.forEach(registerDynamicGetter);
     worldImpact.dynamicSetters.forEach(registerDynamicSetter);
     worldImpact.staticUses.forEach(registerStaticUse);
     worldImpact.instantiatedTypes.forEach(registerInstantiatedType);
     worldImpact.isChecks.forEach(registerIsCheck);
     worldImpact.asCasts.forEach(registerIsCheck);
     if (compiler.enableTypeAssertions) {
       worldImpact.checkedModeChecks.forEach(registerIsCheck);
     }
+    worldImpact.onCatchTypes.forEach(registerIsCheck);
     worldImpact.closurizedFunctions.forEach(registerGetOfStaticFunction);
     worldImpact.closures.forEach(registerClosure);
   }
 
   // TODO(johnniwinther): Remove the need for passing the [registry].
   void registerInstantiatedType(InterfaceType type,
                                 {bool mirrorUsage: false}) {
     task.measure(() {
       ClassElement cls = type.element;
       cls.ensureResolved(resolution);
@@ skipping 868 matching lines @@
   @override
   void processStaticUse(Enqueuer enqueuer, Element element) {
     enqueuer.registerStaticUseInternal(element);
   }
 
   @override
   void processSelector(Enqueuer enqueuer, UniverseSelector selector) {
     enqueuer.handleUnseenSelectorInternal(selector);
   }
 }