It's already branched in epel8. The mold package, which is in the process of being added to Fedora (see #2036468), links against mimalloc.
FEDORA-EPEL-2022-1eab024c6e has been submitted as an update to Fedora EPEL 9. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2022-1eab024c6e
FEDORA-EPEL-2022-1eab024c6e has been pushed to the Fedora EPEL 9 testing repository.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2022-1eab024c6e
See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-EPEL-2022-1eab024c6e has been pushed to the Fedora EPEL 9 stable repository.
If problem still persists, please make note of it in this bug report.