[vm/concurrency] Allow closures as entrypoints in Isolate.spawn calls We already allow sending closures (if immutable via sharing otherwise via copying). This CL makes use of this to allow the argument to `Isolate.spawn()` to be any closure. Similar to normal message sending, the spawn will fail if the closure cannot be sent (or causes an error on the new isolate, e.g. rehashing error). Issue https://github.com/dart-lang/sdk/issues/46623 TEST=vm/dart{_2,}/isolates/closure_entrypoint_test Change-Id: Iab342267d87bd87bc8c0c82d16aec58a69a3df44 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/212295 Reviewed-by: Alexander Aprelev <aam@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
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