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* Simplify runCommand using async/await. * Remove outdated memory leak hack for DDC. * Gather batch runner functionality in BatchRunnerProcess. * Fix process leak that likely caused a hang on test.py shutdown. * Add a test. Change-Id: I87584e4c951ad0fe1650c67db090910acf0f37e4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/408700 Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Alexander Thomas <athom@google.com>