93313bf12d
The back-edge test failed to take into account that a block can have a back-edge to itself. Fixed: 45413 Change-Id: Ib623e6baa2c1de6df131fc67462978a042df5a4e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/192606 Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Stephen Adams <sra@google.com>