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MDEV-20971 ASAN heap-use-after-free in list_delete / heap_close
Don't save/restore HP_INFO as it could be changed by a concurrent thread. different parts of HP_INFO are protected by different mutexes and the mutex that protect most of the HP_INFO does not protect its open_list data. As a bonus, make heap_check_heap() to take const HP_INFO* and not make any changes there whatsoever.
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