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static final _emptyList can't be used in isolategroup mutator code, so the code that uses lists didn't work in that setting neither. Having natively-implemented _emptyList getter fixes this issue. TEST=run_isolate_group_run_test Change-Id: Iad422231829d1dc0994863632521f50f2f8247ab Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/443146 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Alexander Aprelev <aam@google.com>