Replace bit shift with __builtin_ctzll in HyperLogLog (#13218)
## Replace bit shift with `__builtin_ctzll` in HyperLogLog
Builtin function `__builtin_ctzll` is more effective than bit shift even
though "in the average case there are high probabilities to find a 1
after a few iterations" mentioned in the source file comment.
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Co-authored-by:
debing.sun <debing.sun@redis.com>
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