818ec6db92
+ and use nnbd-top-merge and legacy erasure in hierarchy computation Change-Id: I4bf06ce8d3c68a9926865ebf84b24b4029828d73 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128065 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>