Merge XtraDB from Percona server 5.1.49-12 into MariaDB.

mysql-test/suite/percona/percona_sql_no_fcache.test

@@ -0,0 +1,11 @@
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
+
+create table t (a int not null);
+insert into t values (1),(2),(3);
+
+SELECT SQL_NO_FCACHE SLEEP(0);
+SELECT /*!40001 SQL_NO_CACHE */ /*!50084 SQL_NO_FCACHE */ * FROM t;
+
+DROP TABLE t;