asahi: defer texture packing to draw-time

needed for correctness with layout transitions.

fixes arb_shader_image_load_store-host-mem-barrier

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26614>
2 files changed