Fedora includes ABRT for application crash reporting. This is relevant to systemtap to the extent that abrt includes an on-the-fly debuginfo downloader. We should investigate 1) invoking this tool in the case of missing debuginfo and 2) adding the ABRT debuginfo cache path to the elfutils DEBUGINFO_PATH.
commit f70e99355 does part 2; part 1 requires abrt enhancements, see https://bugzilla.redhat.com/show_bug.cgi?id=585039