dwarf_next_cu_header_b(3) on FreeBSD
The text f7cec83eede0, as FreeBSD 12.0-RELEASE, FreeBSD 11.4-RELEASE, FreeBSD 11.3-RELEASE, FreeBSD 11.2-RELEASE, FreeBSD 11.1-RELEASE, FreeBSD 11.0-RELEASE shipped it.
step through compilation units in a DWARF debug context