eb75c53d95
When an initial value is assigned into a class tagged as deeply-immutable, perform runtime check of that value. This is needed to support proper initialization of the closures as part of deeply-immutable classes. BUG=https://github.com/dart-lang/sdk/issues/61962 TEST=run_isolate_group_run_test Change-Id: I550746c0d22ca06ffb89959e8384cc9e6d28d590 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/468200 Commit-Queue: Alexander Aprelev <aam@google.com> Reviewed-by: Slava Egorov <vegorov@google.com>