LP:725050 - Crash with join_cache_hashed with semijoin and join_cache_level=3

The following example causes a crash in 5.3. The reason to set a
debug trace is because it forces the call to print_keyuse() via:
update_ref_and_keys -> print_keyuse_array -> print_keyuse.

create table t1 (a int not null);

set @@optimizer_switch='join_cache_hashed=on,semijoin=on';
set join_cache_level=3;

SET @@debug = 'd:t:O,/tmp/trace.out';

explain
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in (
select a from t1 where a in ( select a from t1)
)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))));

drop table t1;