Pouring concrete over carport concret pad

I enclising my garage and adding anothe bedroom. I will be pouring a 6 inch fiber reinfored slab (will be 8 inches in areas due to how carport slab is made). I am using a bonding agent and cutting expansion joints. The carport has two brick walls and two opens walls supported by pillars. My question is will the bonding agent, walls, and pillars be enough to stop any lateral movement, or should I have some drilled into the existing slab.