a6b1129267
Augmentations no longer have the own Builder objects so the origin and isAugmenting properties can be removed from Builder. Lookup functions have been cleaned up accordingly. Change-Id: Ib872d88d400906ef3ada5f7ec7cb2fb81f8ef4ac Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/416961 Reviewed-by: Jens Johansen <jensj@google.com>