Speed up testing.

lib/src/rastak.dart

 // Copyright (c) 2016, 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.md file.
 
 library rasta.rastak;
 
 import 'dart:async' show
     Future;
 
 import 'dart:isolate' show
     ReceivePort;
 
 import 'package:kernel/ast.dart' as ir;
 
 import 'rastask.dart' show
     Rastask;
 
 Future<ir.TreeNode> main(List<String> arguments, isolateArgument) async {
   final ReceivePort port = new ReceivePort();
   try {
     Stopwatch wallClock = new Stopwatch()..start();
-    Rastask task = await Rastask.setup(wallClock, arguments);
+    Rastask task = await Rastask.create(wallClock, arguments);
 
     // Due to an implementation detail (an optimization that may be wrong) in
     // zones, a `then` handler on a future may be run recursively inside a
     // measuring zone. If the handler belongs to a non-measuring zone, its run
     // time will be incorrectly counted in the measuring zone. In practice, the
     // library loader was blamed for the execution time of rastak. By adding a
     // Rasta task, we avoid counting rastak towards the library loader, and we
     // get a counter for rastak.
     return await task.measure(task.run);
   } finally {
     port.close();
   }
 }