etnaviv: introduce struct etna_compiler

This struct will be used to for state saved across compiler
invocations.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5996>
6 files changed