It was used by the pass tests to verify output with TEST_DEBUG=1,
replace it with brw_print_instructions().
The output is slightly different (not printing IP, not reordering the
blocks), we can add those features as we need, but given the usage was
already very reduced, don't bother with that until need arises.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34012>