Allow Platform.executable for JIT app snapshots.

tests/standalone/io/process_sync_test.dart

 // Copyright (c) 2013, 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.
 
+// OtherResources=process_sync_script.dart
+
 import "package:expect/expect.dart";
 import 'package:path/path.dart';
 import "dart:io";
 
 test(int blockCount,
      int stdoutBlockSize,
      int stderrBlockSize,
      int exitCode,
      [int nonWindowsExitCode]) {
   // Get the Dart script file that generates output.
@@ skipping 38 matching lines @@
   test(1, kBufferSize, kBufferSize, 0);
   test(1, kBufferSize - 1, kBufferSize - 1, 0);
   test(1, kBufferSize + 1, kBufferSize + 1, 0);
 
   test(10, 10, 10, 1);
   test(10, 10, 10, 255);
   test(10, 10, 10, -1, 255);
   test(10, 10, 10, -255, 1);
 }