GPU Lightmass does not support bounce lighting from landscapes

GPU Lightmass does not support bounce lighting from landscapes, but CPU Lightmass does.

1. Download and open the LandscapeTest project from the Additional Info URL case
2. Open GPU Lightmass and build

Expected

Bounce lighting appears on the debug spheres from the landscape walls and floor

Actual

No bounce lighting appears on the debug spheres.  If you perform a CPU Lightmass build, the bounce lighting will appear.

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