Epic's GPUlightmass

[maxbrown]

@Prav2pkp

Getting crash error when using UE 4.26 preview1 GPU Lightmass

Fatal error: …
UE4Editor_RenderCore
UE4Editor_RenderCore
UE4Editor_Core
UE4Editor_Core
…
ntdll

I also had crashes with P1 and P2. Pulling the usb cable from my Oculus Rift fixed that