Remove NameLookupFlags::KnownPrivate

lib/Sema/MiscDiagnostics.cpp

@@ -3458,8 +3458,7 @@ class ObjCSelectorWalker : public ASTWalker {
     auto nominal = method->getDeclContext()->getSelfNominalTypeDecl();
     auto result = TypeChecker::lookupMember(
         const_cast<DeclContext *>(DC), nominal->getDeclaredInterfaceType(),
-        DeclNameRef(lookupName),
-        (defaultMemberLookupOptions | NameLookupFlags::KnownPrivate));
+        DeclNameRef(lookupName), defaultMemberLookupOptions);
 
     // If we didn't find multiple methods, there is no ambiguity.
     if (result.size() < 2) return false;