This was something that I wrote in the early days of the spirv_to_nir code
but deleted once we had a real driver. However, in the absence of a
shader_runner equivalent, it's extremely useful for debugging the
spirv_to_nir code so let's bring it back.
Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
