[gardening] Disarm fork bomb in co19_2 tests in AOT configurations
[gardening] Disarm fork bomb in co19_2 tests in AOT configurations

Issue: https://github.com/dart-lang/co19/issues/1211
Issue: https://github.com/dart-lang/sdk/issues/47394
Change-Id: I6845684cc697555a12b61717254cdf4851fd4c43
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/215880
Reviewed-by: Siva Annamalai <2e618a8cbd7bb6b3d4409061ae407d692a098546@google.com>
Commit-Queue: Alexander Markov <239e774fd29abc1267878f57afe1a8a03e0ca887@google.com>

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