a332c414f1
We need this to stop using UnlinkedUnit with summary2. R=brianwilkerson@google.com, paulberry@google.com Change-Id: Iaca2f19e6a168818e171f09e6eeda71a75854232 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103921 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>