!4467 修复multixact对应的xmax 判断在 in progress时导致的tpcc一致性偶现瞬时校验失败的问题

Merge pull request !4467 from cchen676/pinbufferOK

src/gausskernel/storage/access/heap/heapam_visibility.cpp

@@ -1158,7 +1158,7 @@ recheck_xmax:
             else
                 return false; /* deleted before scan started */
         }
-        if (TransactionIdIsInProgress(xmax))
+        if (!XidVisibleInSnapshot(xmax, snapshot, &hintstatus, InvalidBuffer, NULL))
             return true;
         if (TransactionIdDidCommit(xmax)) {
             /* updating transaction committed, but when? */