C++11 12.8/7 and 12.8/18 say that a copy constructor or copy assignment operator will be implicitly defined under certain conditions, but that doing so is deprecated if the class has a user-declared destructor or user-declared copy or assign. gcc9 issues a deprecation warning in these situations when C++11 or C++14 is selected; earlier versions didn't. We have a few of these, and need to do something about them for JDK-8208089.