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MDEV-16678 Prefer MDL to dict_sys.latch for innodb background tasks
Use std::queue backed by std::deque instead of list because it does less allocations which still having O(1) push and pop operations. Also store trx_purge_rec_t directly, because its only 16 bytes and allocating it is to wasteful. This should be faster. purge_node_t::purge_node_t: container is already empty after creation purge_node_t::end(): replace clearing container with assertion that it's clear
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