a9d9b7395b
TargetFlags.enableNullSafety is set to true by default and also renamed to TargetFlags.soundNullSafety to better reflect its meaning. TEST=ci Change-Id: I2c2f30c2af6502fd9a96141dc60e4afbf8c524fd Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/280216 Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com> Reviewed-by: Siva Annamalai <asiva@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com> Reviewed-by: Aske Simon Christensen <askesc@google.com> Reviewed-by: Daco Harkes <dacoharkes@google.com>