This patch allows allocating results on the host even if the context
uses GPU. It also adds support for uploading the host result into a GPU
allocated result. This is done to allow using results for storing data
that gets computed on the CPU be end up on the GPU, like some of the
cached resources used by the compositor. Those resources are refactored
accordingly in this patch as well.
Pull Request: https://projects.blender.org/blender/blender/pulls/141745
c53a839631