fix core when print savepoint

src/storage/tx/ob_trans_define_v4.h

@@ -523,7 +523,6 @@ public:
                K_(flags_.BLOCK),
                K_(flags_.REPLICA),
                K_(can_elr),
-               K_(savepoints),
                K_(cflict_txs),
                K_(abort_cause),
                K_(commit_expire_ts),

src/storage/tx/ob_xa_ctx.cpp

@@ -1820,6 +1820,8 @@ int ObXACtx::create_xa_savepoint_if_need_(const ObXATransID &xid, const uint32_t
         if (info.is_first_stmt_) {
           if (OB_FAIL(MTL(transaction::ObTransService *)->create_explicit_savepoint(*tx_desc_, PL_XA_IMPLICIT_SAVEPOINT, session_id))) {
             TRANS_LOG(WARN, "create xa savepoint fail", K(ret), K(xid), K(session_id), K(*this));
+          } else {
+            TRANS_LOG(INFO, "create pl xa savepoint success", K(ret), K(xid), K(session_id), K(*this));
           }
           info.is_first_stmt_ = false;
         }