a8e930caf3
+ improve the commonSubclasses implementation to support the implementation of FlatTypeMask.intersection and RuntimeEquals.equals computation. Change-Id: I51c4d229e9dc6d5de101aff33e56bb44bf93bc0d Reviewed-on: https://dart-review.googlesource.com/61927 Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>