[automerger skipped] Fix wrong assumption in RemoveInstructionsAsUsersFromDeadBlocks.
am: 6b4a474e5f -s ours
am skip reason: change_id I853956482487a8c7c8fb99499aef318d099754e4 with SHA1 2cc9d34355 is in history

Change-Id: I1df4ff12635a3cb379e818c3f6c6b30b15846c3c