tso: merge lastTS and lastArrivalTS into an atomic pointer (#1054) #1063
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* fix the issue that stale timestamp may be a future one Signed-off-by: you06 <you1474600@gmail.com> * add regression test Signed-off-by: you06 <you1474600@gmail.com> * lazy init lastTSO Signed-off-by: you06 <you1474600@gmail.com> * fix panic Signed-off-by: you06 <you1474600@gmail.com> * address comment Signed-off-by: you06 <you1474600@gmail.com> --------- Signed-off-by: you06 <you1474600@gmail.com>
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Cherry pick #1054 to tidb-7.1 branch, which fix the monotonic issue of stale TSO.