Fix `join` and `concatenate` to use the supplied allocator
Fix `join` and `concatenate` to use the supplied allocator

ThisDrunkDane/Odin,ThisDrunkDane/Odin,ThisDrunkDane/Odin,gingerBill/Odin,gingerBill/Odin,gingerBill/Odin,gingerBill/Odin