Sign relative protocol witness tables

rdar://98583748

stdlib/public/runtime/ProtocolConformance.cpp

@@ -1163,6 +1163,7 @@ swift_conformsToProtocolImpl(const Metadata *const type,
     std::tie(table, hasUninstantiatedSuperclass) =
         swift_conformsToProtocolMaybeInstantiateSuperclasses(
             type, protocol, true /*instantiateSuperclassMetadata*/);
+
   return table;
 }