This change puts all the block size macros in the same common header, so they can be included in host side code without needing to also include the kernels that are defined in the device headers that contained these values. This change also removes a magic number used to enqueue a kernel, which happened to agree with the GPU_PARALLEL_SORT_BLOCK_SIZE macro. Pull Request: https://projects.blender.org/blender/blender/pulls/143646