Fix gold error: hidden symbol '...' is not defined locally

[Alan Modra]

Found when applying relocs in .debug that reference removed functions.

	PR 17954
	* powerpc.cc (Global_symbol_visitor_opd::operator()): Set default
	visibility.

diff --git a/gold/powerpc.cc b/gold/powerpc.cc
index ac8d05b..4deb5af 100644
--- a/gold/powerpc.cc
+++ b/gold/powerpc.cc
@@ -6551,6 +6551,7 @@ class Global_symbol_visitor_opd
 	&& symobj->get_opd_discard(sym->value()))
       {
 	sym->set_undefined();
+	sym->set_visibility(elfcpp::STV_DEFAULT);
 	sym->set_is_defined_in_discarded_section();
 	sym->set_symtab_index(-1U);
       }

-- 
Alan Modra
Australia Development Lab, IBM