add time guard for data_checkpoint lock add lock for update_clog_checkpoint

src/storage/checkpoint/ob_checkpoint_executor.h

@@ -102,6 +102,7 @@ private:
   typedef common::SpinRLockGuard  RLockGuard;
   typedef common::SpinWLockGuard  WLockGuard;
   RWLock rwlock_;
+  RWLock rwlock_for_update_clog_checkpoint_;
 
   bool update_checkpoint_enabled_;
 };