Forces the compilation of the vslayer shader permutation even if the platform (RHI) does not declare compile-time support through RHISupportsVertexShaderLayer.Enabled by default for windows/SM5 as DX11 almost universally supports this at runtime.
Usage
r.Shadow.DetectVertexShaderLayerAtRuntime [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.
