With Accurate Velocities from Vertex Deformation and Instanced Stereo enabled anti-aliasing does not affect the right eye

KevinR: Make sure you are using Temporal AA (TXAA), and I was using SteamVR/Vive

With Accurate Velocities from Vertex Deformation and Instanced Stereo enabled anti-aliasing does not affect the right eye. This does not occur if only one or the other setting is enabled. It does not occur if neither setting is enabled. Only if both are on.

Found on:
//UE4/Main CL-3043181
//UE4/Dev-VR CL-3042730

1. Open UE4Editor.exe QAGAME
2. Open the Project settings and in Rendering setting enable the following then restart.
   1. Accurate Velocities from Vertex Deformation
   2. Instanced Stereo
3. Once restarted open the TM-EngineScalability map
4. Play in VR Preview
5. Navigate down the map to the 2.1 AntiAliasing setup
6. Look closely at the spokes, closing one eye at a time to detect differences

Result: AA only affects the left eye.