util/hash_table: added hash functions for integer types

A few hash_table users roll their own integer hash functions which
call _mesa_hash_data to perform the hashing which ultimately calls
into XXH32 with a dynamic key length. When using small keys with a
constant size the hash rate can be greatly improved by inlining
XXH32 and providing it a constant key length, see:
https://fastcompression.blogspot.com/2018/03/xxhash-for-small-keys-impressive-power.html

Additionally, this patch removes calls to _mesa_key_hash_string and
makes them instead call _mesa_has_string directly, matching the new
integer hash functions.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3475>

src/intel/perf/gen_perf.c

@@ -967,7 +967,7 @@ load_oa_metrics(struct gen_perf_config *perf, int fd,
       return false;
 
    perf->oa_metrics_table =
-      _mesa_hash_table_create(perf, _mesa_key_hash_string,
+      _mesa_hash_table_create(perf, _mesa_hash_string,
                               _mesa_key_string_equal);
 
    /* Index all the metric sets mesa knows about before looking to see what