dwarf_get_cu_die_offset_given_cu_header_offset_b(3) on FreeBSD

The text 37da0e00d9f1, 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.

return offsets of DWARF debugging information entries

dwarf_get_cu_die_offset_given_cu_header_offset_b(3) on FreeBSD now