Blender Git Loki

Cycles X: Reduce memory usage of OptiX denoiser and CPU render

Allow to modify a temporary buffer created in the DeviceDenoiser.

Moved denoised pass copy to a more accessible function. It is not
very flexible yet, and performance might be improved, but it fits
current usage and is only used from a much more compute-heavy steps
of the render.

Differential Revision: https://developer.blender.org/D11874