mvcc/reader: scan versions from u64::max to start_ts in get_txn… (#5062)
mvcc/reader: scan versions from u64::max to start_ts in get_txn… (#5062)


BusyJay/tikv,BusyJay/tikv,c4pt0r/tikv,pingcap/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv