BUG #8468: Create index on type tstzrange fail

The following bug has been logged on the website:

Bug reference: 8468
Logged by: marian
Email address: marian(dot)krucina(at)gmail(dot)com
PostgreSQL version: 9.3.0
Operating system: Linux
Description:

CREATE INDEX ON tstzrange fail on 9.3.0 and 9.2.4 - default postgres
configuration.
It ate whole memory and was killed by oom.

Example:
postgres=# CREATE TABLE range_test AS SELECT tstzrange(t, t+'1min') tr FROM
generate_series('2000-1-1'::TIMESTAMPTZ, '2010-1-1'::TIMESTAMPTZ, '1min') AS
t1(t);
SELECT 5260321
postgres=# CREATE INDEX ON range_test(tr);
WARNING: terminating connection because of crash of another server process
DETAIL: The postmaster has commanded this server process to roll back the
current transaction and exit, because another server process exited
abnormally and possibly corrupted shared memory.
HINT: In a moment you should be able to reconnect to the database and
repeat your command.
The connection to the server was lost. Attempting reset: Failed.