3ed0ce2419
It's a part of internal cleanup of pkg/kernel and pkg/front_end. The nullability modifier is reused whenever a type object is created as a (potentially modified) copy of another type object. Change-Id: I9d09a744281e33814289a4f4dd65c764a7905eff Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/125260 Reviewed-by: Johnni Winther <johnniwinther@google.com>