mesa: remove _mesa_init_get_hash()

mesa: remove _mesa_init_get_hash()

The actual code of the function print_table_stats() is guarded
by a ifdef GET_DEBUG, which was not been defined in years.

The last fix in 2013 (7db6b5aa91a) indicates that it's rarely
used/tested. Since the issue has gone unnoticed for a whole year
(broken with 2ad4a475474).

Let's remove it for now. We can always revive it at a later stage.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>