Make --noopt behave like an in-place precompilation.

tests/standalone/noopt_test.dart

Index: tests/standalone/noopt_test.dart
diff --git a/tests/compiler/dart2js/dart2js_batch2_run.dart b/tests/standalone/noopt_test.dart
similarity index 80%
copy from tests/compiler/dart2js/dart2js_batch2_run.dart
copy to tests/standalone/noopt_test.dart
index aee55ef18e5fa77c47bcbf53f5c16125299ed77a..171f3a5d2554f0e0308194fcd8a88408479da3e6 100644
--- a/tests/compiler/dart2js/dart2js_batch2_run.dart
+++ b/tests/standalone/noopt_test.dart
@@ -2,9 +2,8 @@
 // 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.
 
-@notExisting
-var x;
+/// VMOptions=--noopt
 
 main() {
-  print(x);
+  print("Hello, --noopt World!");
 }