Handle const constructor invocation in kernel_impact.

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/names.dart' show Identifiers;
 import 'common/resolution.dart' show Resolution;
@@ skipping 578 matching lines @@
         // TODO(johnniwinther): Avoid this. Currently [FIELD_GET] and
         // [FIELD_SET] contains [BoxFieldElement]s which we cannot enqueue.
         // Also [CLOSURE] contains [LocalFunctionElement] which we cannot
         // enqueue.
         addElement = false;
         break;
       case StaticUseKind.SUPER_FIELD_SET:
       case StaticUseKind.SUPER_TEAR_OFF:
       case StaticUseKind.GENERAL:
         break;
+      case StaticUseKind.CONSTRUCTOR_INVOKE:
+      case StaticUseKind.CONST_CONSTRUCTOR_INVOKE:
+        registerTypeUse(new TypeUse.instantiation(staticUse.type));
+        break;
     }
     if (addElement) {
       addToWorkList(element);
     }
   }
 
   void registerTypeUse(TypeUse typeUse) {
     DartType type = typeUse.type;
     switch (typeUse.kind) {
       case TypeUseKind.INSTANTIATION:
         registerInstantiatedType(type);
         break;
-      case TypeUseKind.INSTANTIATION:
       case TypeUseKind.IS_CHECK:
       case TypeUseKind.AS_CAST:
       case TypeUseKind.CATCH_TYPE:
         _registerIsCheck(type);
         break;
       case TypeUseKind.CHECKED_MODE_CHECK:
         if (compiler.options.enableTypeAssertions) {
           _registerIsCheck(type);
         }
         break;
@@ skipping 286 matching lines @@
 }
 
 typedef void _DeferredActionFunction();
 
 class _DeferredAction {
   final Element element;
   final _DeferredActionFunction action;
 
   _DeferredAction(this.element, this.action);
 }