Comment 1 for bug 1867188

This is supposed to be fixed in Mesa 20.1 git by c81aa15d, gallium/auxiliary/vl: fix bob compute shaders for deint yuv.
See:
https://gitlab.freedesktop.org/mesa/mesa/-/commit/c81aa15d646215eac38c8e0b6dc1a10b35bc13c3

This could be backported to Mesa 20 if someone wants to try it.