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This is in preparation for supporting `augment super` access of augmented members. Change-Id: Ib306ef59faa7c9ad735304545aa414f6b21e2596 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249862 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Jens Johansen <jensj@google.com>