MDEV-15149 Assert upon concurrent creating / querying sequences

MDEV-15117 Server crashes in in open_and_process_table or ASAN
heap-use-after-free in is_temporary_table upon creating/flushing
sequences.

Problem was that sequence_insert closed and reopened the like table
without proper locking.  Fixed by ensuring that the like table is
not reopened in sequence_insert

mysql-test/suite/sql_sequence/concurrent_create.result

@@ -22,3 +22,12 @@ select * from s2;
 next_not_cached_value	minimum_value	maximum_value	start_value	increment	cache_size	cycle_option	cycle_count
 1	1	9223372036854775806	1	1	1000	0	0
 DROP SEQUENCE s1, s2;
+CREATE SEQUENCE s1 ENGINE=InnoDB;
+connect  con1,localhost,root,,test;
+CREATE TABLE s2 LIKE s1;;
+connection default;
+FLUSH TABLES;
+connection con1;
+disconnect con1;
+connection default;
+DROP TABLE s1,s2;

mysql-test/suite/sql_sequence/concurrent_create.test

@@ -38,3 +38,21 @@ execute stmt;
 select * from s2;
 DROP SEQUENCE s1, s2;
 
+#
+# MDEV-15117 Server crashes in in open_and_process_table or ASAN
+# heap-use-after-free in is_temporary_table upon creating/flushing sequences
+#
+
+CREATE SEQUENCE s1 ENGINE=InnoDB;
+--connect (con1,localhost,root,,test)
+--send CREATE TABLE s2 LIKE s1;
+--connection default
+FLUSH TABLES;
+
+# Cleanup
+--connection con1
+--reap
+--disconnect con1
+--connection default
+
+DROP TABLE s1,s2;