Handle const constructor invocation in kernel_impact.

pkg/compiler/lib/src/js_backend/enqueuer.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.js.enqueue;
 
 import 'dart:collection' show Queue;
 
 import '../common/backend_api.dart' show Backend;
 import '../common/codegen.dart' show CodegenWorkItem;
@@ skipping 513 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 (options.enableTypeAssertions) {
           _registerIsCheck(type);
         }
         break;
@@ skipping 142 matching lines @@
   @override
   void visitStaticUse(StaticUse staticUse) {
     enqueuer.registerStaticUse(staticUse);
   }
 
   @override
   void visitTypeUse(TypeUse typeUse) {
     enqueuer.registerTypeUse(typeUse);
   }
 }