b36fbaef2c
In computation of GUB both the left-hand and the right-hand sides of the intersection should be updated as nullable when the other operator to GUB is Null. Closes https://github.com/dart-lang/sdk/issues/50431 Change-Id: I4b616a94a3e7bf149205ba1b90732453c19ace47 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/311845 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Chloe Stefantsova <cstefantsova@google.com>