Add FLUSH TABLES to avoid corruption of MyISAM system tables

mysql-test/suite/innodb/r/innodb-blob.result

+FLUSH TABLES;
 CREATE TABLE t1 (a INT PRIMARY KEY, b TEXT) ENGINE=InnoDB;
 CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=InnoDB;
 CREATE TABLE t3 (a INT PRIMARY KEY, b TEXT, c TEXT) ENGINE=InnoDB;

mysql-test/suite/innodb/t/innodb-blob.test

@@ -5,12 +5,14 @@
 --source include/have_innodb.inc
 --source include/have_innodb_16k.inc
 
-# DEBUG_SYNC must be compiled in.
+--source include/have_debug.inc
 --source include/have_debug_sync.inc
 
 # Embedded server does not support restarting
 --source include/not_embedded.inc
 
+FLUSH TABLES;
+
 CREATE TABLE t1 (a INT PRIMARY KEY, b TEXT) ENGINE=InnoDB;
 CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=InnoDB;
 CREATE TABLE t3 (a INT PRIMARY KEY, b TEXT, c TEXT) ENGINE=InnoDB;