mysql: race condition while setting stats during MyISAM table repair (CPU Oct 2016)

DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: CVE-2016-6663. Reason: This candidate is a reservation duplicate of CVE-2016-6663. Notes: All CVE users should reference CVE-2016-6663 instead of this candidate. All references and descriptions in this candidate have been removed to prevent accidental usage