Blender Git Loki

Cycles X: Implement OptiX denoising of shadow catcher passes

Pretty much follows similar change in the OIDN.

The information about whether denoiser should use fake albedo for a
specific pass is stored in its PassInfo.

It is probably possible to improve performance of the filter_convert_to_rgb
kernel (avoid per-pixel fake albedo check, avoid scaling normal for every
denoising input pass, ...). Not sure it will bring measurable performance
so leaving it for the future development and investigation.

Differential Revision: https://developer.blender.org/D11614