[automerger] Decoder: Delete node from st if lt and st point to same am: f312a1d305 am: f82a1f8d7f am: ae2c8cfdc1 am: 8332d0bfa2 am: 1e6ef7fee5

Change-Id: Id6d3411d949ae069369d7bef1c50f904cf9c97dc