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d602837b91
Enhance hash perfomance by remembering the computed hash value for the hashed node - this allows to speedup lookup of nodes with the hash collision when different keys map to the same masked hash value. For the easier use 'num_slots' become 'mask_slots', so we only add '1' in rare case of need of the original num_slots value. Also add statistic counters for hashes and print stats in debug build (-DDEBUG) on hash wiping. (so badly performing hash can be optimized.)