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At the moment, we always use an in-memory store for computed units and elements. By persisting this to file and re-using it across builds, we can speed up subsequent build runs. Change-Id: I6fca9d96f6961a3a802eb1d4cb21682fc0fcc469 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/270400 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Auto-Submit: Simon <oss@simonbinder.eu> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>