[co19] Generics and Superinterfaces tests enabled
[co19] Generics and Superinterfaces tests enabled

Change-Id: If95d1ba2f935135c2038eb9a6e3525d62fccf72f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151529
Reviewed-by: Alexander Thomas <29642742b6693024c89de8232f2e2542cf7eedf7@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk