Remove windows debug print and trace shutdown on some tests

tests/isolate/package_config_test.dart

 // Copyright (c) 2015, 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.
-
+// VMOptions=--trace_shutdown
 import 'dart:io';
 import 'dart:isolate';
 
 final SPAWN_PACKAGE_CONFIG = "foobar:///no/such/file/";
 
 main([args, port]) async {
   if (port != null) {
     testPackageConfig(port);
     return;
   }
@@ skipping 15 matching lines @@
   print("Spawning isolate's package config: ${await Isolate.packageConfig}");
 }
 
 testPackageConfig(port) async {
   var packageConfigStr = Platform.packageConfig;
   var packageConfig = await Isolate.packageConfig;
   print("Spawned isolate's package config flag: $packageConfigStr");
   print("Spawned isolate's loaded package config: $packageConfig");
   port.send([packageConfigStr, packageConfig?.toString()]);
 }