[vm/ffi] Fix ffi trampoline class finalization - fix test on android

Change-Id: I4389667701de45827e093305bdda8443520abe54
Cq-Include-Trybots: luci.dart.try:vm-ffi-android-debug-arm-try, app-kernel-linux-debug-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103844
Commit-Queue: Daco Harkes <[email protected]>
Reviewed-by: Daco Harkes <[email protected]>

Author: dcharkes

tests/ffi/regress_37100_test.dart

@@ -1,6 +1,8 @@
 // Copyright (c) 2019, 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.
+//
+// SharedObjects=ffi_test_functions
 
 import 'dart:ffi';