ff778d1cb4
Not doing it can lead to the same input producing "different" outputs.
Note that this is a follow-up to cdcec63569
where I forgot about the incremental summary-only case.
Change-Id: Idf76c3839f46c468a62350968b353be7235d91b9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/118287
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>