33b7721c51
This is a safeguard to prevent accidental uses of this API by embedders if those embedders do not pass --enable-isolate-groups. Issue https://github.com/dart-lang/sdk/issues/36097 TEST=runtime/tests/vm/dart/isolates/dart_api_create_lightweight_isolate_test.dart Change-Id: Iba667f0e9fbbb33de963fabb80da546df794257c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/174404 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>