Check if Hash bucket is calculated multiple times (from the key) in the calls to hash table functions

Example:
HashTable::unlocked_addNewStoredValue() calculates hash bucket_num from the key.
(int bucket_num = getBucketForHash(itm.getKey().hash()))

But the callers of the functions have calculated the hash bucket before. We could pass it as a param rather than recalculating it.

There maybe many more cases like this in the hash table