intel/compiler: Get rid of the global compaction table pointers

intel/compiler: Get rid of the global compaction table pointers

With discrete GPUs, it's going to be possible to have GPUs from two
different hardware generations in the machine at the same time.  Global
singletons like this aren't going to fly.  Have a struct containing the
pointers which gets initialized once per shader disassemble instead.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6244>