Before this change, the analyzer supported analyzing legacy code if
the (somewhat confusingly named) global variable `noSoundNullSafety`
was set to `false`. This was used to support legacy code while google3
was still migrating to null safety.
Now that the internal migration process is complete, the analyzer no
longer needs to support legacy code. As a first step in removing that
support, this change removes the `noSoundNullSafety` flag and all the
unit tests that made use of it.
From this point forward it will not be possible to use the analyzer to
analyze code that has a Dart language version less than 2.12.
Change-Id: Idce4b271d1cfc43d25251b7a899259d62b421caf
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/345365
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
Reviewed-by: Phil Quitslund <pquitslund@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Paul Berry
c46b63d2c7