START TRANSACTION WITH CONSISTENT SNAPSHOT does not work for PBXT

[Kristian Nielsen]

CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=innodb;
CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=pbxt;
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
START TRANSACTION WITH CONSISTENT SNAPSHOT;
SELECT * FROM t1;
# Let another transaction change table t2 ...
SELECT * FROM t2;

The last SELECT should not see the changes made to t2 by other transactions
after executing START TRANSACTION WITH CONSISTENT SNAPSHOT, however they do.

This works correctly when table t2 is an InnoDB table.

Tested on latest MariaDB lp:maria.

Full test case and result file attached.