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While this adds an intermediary form for impact computation, it did not seem to noticeably change the time it takes to compute the closed world on a large application. In addition, it will be a necessary change if we want to start moving some of the validation currently being performed while building `ResolutionImpact`s modularly. Change-Id: I76d63a34bbd099103051ead67ec54fd38142929a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/235482 Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Joshua Litt <joshualitt@google.com>