fix TSAN warnings about on clearing empty hashtables #560
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Different empty instances of hashtable (hast_map, hash_set...) are all pointing to the same global memory region `gpEmptyBucketArray`. Rewrite `hashtable<>::DoFreeNodes` in such way to avoid writing into said memory. Caught by ThreadSanitizer on clear'ing different (but empty) hashtable instances
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Different empty instances of hashtable (hast_map, hash_set...) are all pointing to the same global memory region
gpEmptyBucketArray. Rewritehashtable<>::DoFreeNodesin such way to avoid writing into said memory.Caught by ThreadSanitizer on clear'ing different (but empty) hashtable instances