cf7d78cc2c
Update the dart2js and kernel worker steps themselves to run with sound null safety. This is separate from the code being compiled in the step which will be migrated in another change. Change-Id: Idbaaeb255209e79bb34aa34aedeb020be097c1c5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/289408 Commit-Queue: Nicholas Shahan <nshahan@google.com> Reviewed-by: Nate Biggs <natebiggs@google.com>