Create closed world for hello world using .dill file

pkg/compiler/lib/src/helpers/trace.dart

 // Copyright (c) 2014, 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.
 
 import '../common.dart';
 import '../util/util.dart';
 
 /// Function signature for [trace].
 typedef void Trace(String message,
     {bool condition(String stackTrace), int limit, bool throwOnPrint});
@@ skipping 119 matching lines @@
     // expression. The last case is used for async bodies.
     for (String line in stackTrace.split('\n')) {
       try {
         index++;
         if (rangeStart != null && index < rangeStart) continue;
         if (rangeEnd != null && index > rangeEnd) break;
         if (line.isEmpty) continue;
 
         // Strip index.
         line = line.replaceFirst(indexPattern, '');
+        if (line == '<asynchronous suspension>') {
+          lines.add(new StackTraceLine(index, '', '', '', line));
+          continue;
+        }
 
         int leftParenPos = line.indexOf('(');
         int rightParenPos = line.indexOf(')', leftParenPos);
         int lastColon = line.lastIndexOf(':', rightParenPos);
         int nextToLastColon = line.lastIndexOf(':', lastColon - 1);
 
         String lineNo;
         String columnNo;
         if (nextToLastColon != -1) {
           lineNo = line.substring(nextToLastColon + 1, lastColon);
@@ skipping 188 matching lines @@
   }
   for (int index = text.length; index < intendedLength; index++) {
     int dotsIndex = index % dotsLength;
     sb.write(dots.substring(dotsIndex, dotsIndex + 1));
   }
   if (padLeft) {
     sb.write(text);
   }
   return sb.toString();
 }