mesa/st/i965: add a ProgramResourceHash for quicker resource lookup

mesa/st/i965: add a ProgramResourceHash for quicker resource lookup

Many resource APIs require searching by name, add a hash table to make
this faster. Currently we traverse the whole resource list for name
based queries, this change makes all these cases use the hash.

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2203
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3254>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3254>