// be populated, so that it can walk the functions in each unit.
	// Call into the loader to do this (requires that we collect the
	// set of internal libraries first). NB: might be simpler if we
	// moved isRuntimeDepPkg to cmd/internal and then did the test in
	// loader.AssignTextSymbolOrder.
	ctxt.Library = postorder(ctxt.Library)
	intlibs := []bool{}
	for _, lib := range ctxt.Library {