dwarf_add_typename(3) on FreeBSD
The text 53a649510aec, 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.
add information about a user-defined type to a DWARF producer instance