[test] Mark check_for_aot_snapshot_jit_test as Slow.

Change-Id: I9275e90431907c5e730bd895a2db75be260ab53c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/424280
Commit-Queue: Ryan Macnak <[email protected]>
Reviewed-by: Alexander Aprelev <[email protected]>

Author: rmacnak-google

tests/standalone/standalone_vm.status

@@ -2,6 +2,7 @@
 # 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.
 
+check_for_aot_snapshot_jit_test: Slow, Pass # Has nested AOT compilation
 io/non_utf8_output_test: NonUtf8Output
 
 [ $arch == ia32 ]