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bc7a1dc1fb
With trx_sys_t::rw_trx_ids removal, MVCC snapshot overhead became slightly higher. That is instead of copying an array we now have to iterate LF_HASH. All this done under trx_sys.mutex protection. This patch moves MVCC snapshot out of trx_sys.mutex. Clean-ups: Removed MVCC: doesn't make too much sense to keep it in a separate class anymore. Refactored ReadView so that it now calls register()/deregister() routines (it was vice versa before). ReadView doesn't have friends anymore. :( Even less trx_sys.mutex references.