Process exit code handling reworked for Windows.

tests/standalone/io/process_many_script.dart

Index: tests/standalone/io/process_many_script.dart
diff --git a/tests/standalone/io/process_many_script.dart b/tests/standalone/io/process_many_script.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7c4064ccb97b9d7183f5114ac944a1f0dba8fc13
--- /dev/null
+++ b/tests/standalone/io/process_many_script.dart
@@ -0,0 +1,10 @@
+// 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.
+
+#import('dart:io');
+
+main() {
+  var stream = new StringInputStream(stdin);
+  stream.onLine = () => exit(0);
+}