Hyperscan better usage of scratch space and error handling #4866
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For changelog. Remove if this is non-significant change.
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We use hs_clone_scratch instead of hs_alloc_scratch because it is faster and recommended by the hyperscan API. Also, I add error handling for hs_scan (everything can happen, we should know about this).
Databaseis thread-safe,Scratchcan be allocated once and copied many times. So no need to use the old pool, it is better to once safely add Regexps and use it over times.