MDEV-7962 post-push fixes

This is a partial backport of
commit 5e7e7153 from 10.4.

assert_trx_is_free(): Assert !is_wsrep().

trx_init(): Do not initialize trx->wsrep, because it must have been
initialized already.

trx_commit_in_memory(): Invoke wsrep_commit_ordered(). This call
was being skipped, because the transaction object had already been
freed to the pool.

trx_rollback_for_mysql(), innobase_commit_low(),
innobase_rollback_trx(): Always reset trx->wsrep.

storage/innobase/handler/ha_innodb.cc

@@ -4467,27 +4467,35 @@ innobase_commit_low(
 {
 #ifdef WITH_WSREP
 	const char* tmp = 0;
-	if (trx->is_wsrep()) {
+	const bool is_wsrep = trx->is_wsrep();
+	THD* thd = trx->mysql_thd;
+	if (is_wsrep) {
 #ifdef WSREP_PROC_INFO
 		char info[64];
 		info[sizeof(info) - 1] = '\0';
 		snprintf(info, sizeof(info) - 1,
 			 "innobase_commit_low():trx_commit_for_mysql(%lld)",
-			 (long long) wsrep_thd_trx_seqno(trx->mysql_thd));
-		tmp = thd_proc_info(trx->mysql_thd, info);
+			 (long long) wsrep_thd_trx_seqno(thd));
+		tmp = thd_proc_info(thd, info);
 #else
-		tmp = thd_proc_info(trx->mysql_thd, "innobase_commit_low()");
+		tmp = thd_proc_info(thd, "innobase_commit_low()");
 #endif /* WSREP_PROC_INFO */
 	}
 #endif /* WITH_WSREP */
 	if (trx_is_started(trx)) {
-
 		trx_commit_for_mysql(trx);
+	} else {
+		trx->will_lock = 0;
+#ifdef WITH_WSREP
+		trx->wsrep = false;
+#endif /* WITH_WSREP */
 	}
-	trx->will_lock = 0;
+
 #ifdef WITH_WSREP
-	if (trx->is_wsrep()) { thd_proc_info(trx->mysql_thd, tmp); }
+	if (is_wsrep) {
+		thd_proc_info(thd, tmp);
 #endif /* WITH_WSREP */
+	}
 }
 
 /*****************************************************************//**
@@ -4836,6 +4844,9 @@ innobase_rollback_trx(
 
 	if (!trx->has_logged()) {
 		trx->will_lock = 0;
+#ifdef WITH_WSREP
+		trx->wsrep = false;
+#endif
 		DBUG_RETURN(0);
 	}
 

storage/innobase/include/trx0trx.h

@@ -553,6 +553,7 @@ Check transaction state */
 	ut_ad(!(t)->id);						\
 	ut_ad(!(t)->has_logged());					\
 	ut_ad(!(t)->is_referenced());					\
+	ut_ad(!(t)->is_wsrep());					\
 	ut_ad(!MVCC::is_view_active((t)->read_view));			\
 	ut_ad((t)->lock.wait_thr == NULL);				\
 	ut_ad(UT_LIST_GET_LEN((t)->lock.trx_locks) == 0);		\

storage/innobase/trx/trx0roll.cc

@@ -189,6 +189,9 @@ dberr_t trx_rollback_for_mysql(trx_t* trx)
 	case TRX_STATE_NOT_STARTED:
 		trx->will_lock = 0;
 		ut_ad(trx->in_mysql_trx_list);
+#ifdef WITH_WSREP
+		trx->wsrep = false;
+#endif
 		return(DB_SUCCESS);
 
 	case TRX_STATE_ACTIVE:

storage/innobase/trx/trx0trx.cc

@@ -102,9 +102,6 @@ trx_init(
 	trx->state = TRX_STATE_NOT_STARTED;
 
 	trx->is_recovered = false;
-#ifdef WITH_WSREP
-	trx->wsrep = false;
-#endif /* WITH_WSREP */
 
 	trx->op_info = "";
 
@@ -1821,6 +1818,9 @@ trx_commit_in_memory(
 
 	DBUG_LOG("trx", "Commit in memory: " << trx);
 	trx->state = TRX_STATE_NOT_STARTED;
+#ifdef WITH_WSREP
+	trx->wsrep = false;
+#endif
 
 	/* trx->in_mysql_trx_list would hold between
 	trx_allocate_for_mysql() and trx_free_for_mysql(). It does not