[automerger] Decoder: Delete node from st if lt and st point to same am: f312a1d305 am: f82a1f8d7f am: ae2c8cfdc1 am: 8332d0bfa2 am: 1e6ef7fee5 am: b1734142ff am: 9460fbd521 am: 224bcf4592 am: d406f08816
am: 75cd59e45b

Change-Id: I3fc2480bebd777aee2d4e7efe0a05dbad35c299f