panfrost: Use pack for fragment shaders

The heart of the series! Build up all the structures separately and
combine with an OPAQUE pack. Groups state naturally and eliminates the
memcpy. And a nice cleanup too.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6440>
2 files changed