7fd20c724d
Calculates and prints the number of files blocked by each unmigrated file. Adds he option for a flag to sort by number of blocking files. Change-Id: I565f565d2d68e6d630bb2c9bb6d7fc46b016e365 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/251180 Commit-Queue: Nate Biggs <natebiggs@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>