Add hashmap_set_by_hash, and hashmap_get_by_hash.

hashmap.h

@@ -36,7 +36,9 @@ void hashmap_clear(struct hashmap *map, bool update_cap);
 size_t hashmap_count(struct hashmap *map);
 bool hashmap_oom(struct hashmap *map);
 void *hashmap_get(struct hashmap *map, const void *item);
+void *hashmap_get_by_hash(struct hashmap *map, const void *item);
 void *hashmap_set(struct hashmap *map, const void *item);
+void *hashmap_set_by_hash(struct hashmap *map, const void *key, const void *item);
 void *hashmap_delete(struct hashmap *map, void *item);
 void *hashmap_probe(struct hashmap *map, uint64_t position);
 bool hashmap_scan(struct hashmap *map,