SDirtySetMask in vehicle.cc replaced with what?

Hello. I'm currently adding turrets based on Paul Dana's resource: Turret & AITurret classes and have run into a bit of a snag.

It looks like this code used to exist in the vehicle.cc file:

static U32 sDirtySetMask = PlayerObjectType     |
                           TurretObjectType |
                           VehicleObjectType;

However, in the 1_2++ release of the engine code, this code is MIA.

So what I'm wondering is,

1. Where did it go, or better yet what replaced it?
2. If I wanted to add the equivalent of this:

static U32 sDirtySetMask = PlayerObjectType     |
                           // phdana turrets ->
                           TurretObjectType |
                           // <- phdana turrets
                           VehicleObjectType;

how would I do it?

So, any insight would be greatly appreciated.

Thanks to any taker(s).

[HOW]-Ed