d50097a4ec
Reduces the number of libraries that must be migrated to null safety atomically. Change-Id: I498f2956471be0435558c1b1a4badcba619f15de Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/247521 Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>