// MakeTypelink attribute by the compiler.
func (ctxt *Link) typelink() {
	ldr := ctxt.loader
	typelinks := byTypeStr{}
	var itabs []loader.Sym
	for s := loader.Sym(1); s < loader.Sym(ldr.NSym()); s++ {
		if !ldr.AttrReachable(s) {
			continue
		}
		if ldr.IsTypelink(s) {
			typelinks = append(typelinks, typelinkSortKey{decodetypeStr(ldr, ctxt.Arch, s), s})
		} else if ldr.IsItab(s) {
			itabs = append(itabs, s)
		}
	}