Allow Platform.executable for JIT app snapshots.

tests/standalone/io/signals_test.dart

Index: tests/standalone/io/signals_test.dart
diff --git a/tests/standalone/io/signals_test.dart b/tests/standalone/io/signals_test.dart
index a8112088df187ac07011a1afb8a6970f6e66224c..910c2c40a8261fa2e2492b1fcdce37a1011bea31 100644
--- a/tests/standalone/io/signals_test.dart
+++ b/tests/standalone/io/signals_test.dart
@@ -2,6 +2,9 @@
 // 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=signal_test_script.dart
+// OtherResources=signals_test_script.dart
+
 import "dart:io";
 import "dart:convert";