message: VirtualMerging: Another visibility fix
  Summary:
  {D16530050} wasn't quite a complete fix because a later line of code was
  unintentionally clearing all the visiblity flags.
diff: @@ -412,7 +412,7 @@ void VirtualMerging::merge_methods() {
  // we'll add an invoke-virtual instruction that will get inlined.
  m_stats.unabstracted_methods++;
  overridden_method->make_concrete(
  - (DexAccessFlags)(overridden_method->get_access() & !ACC_ABSTRACT),
  + (DexAccessFlags)(overridden_method->get_access() & ~ACC_ABSTRACT),
  std::make_unique<IRCode>(),
  true /* is_virtual */);
  overridden_code = overridden_method->get_code();
  