As http://forums.gentoo.org/viewtopic.php?p=8534653#8534653 said. The sanitizer doesn't exist. Only compute-sanitizer exists. It may be a bug.
Thank you for the report. We need to have all information at hand before ticket assignment. That is why I ask you to * attach the logs and * paste the emerge info as described on https://wiki.gentoo.org/wiki/Attach_the_logs_to_the_bug_ticket Please reopen this ticket (Status:UNCONFIRMED) afterwards.