Diagonal loop filter scan now works in both directions!
Diagonal loop filter scan now works in both directions!

Had to be modified so that the columns are offset by 2 from the previous/next
rows, so number of kernel launches will be:

	2 * ( Height - 1 ) + Width

instead of:
	( Height - 1 ) + Width

This is still much better than the original, which was Height * Width.

awatry/libvpx.opencl,awatry/libvpx.opencl,awatry/libvpx.opencl,awatry/libvpx.opencl