fix exceptionStr to work for derived classes of std::exception
Summary: templates and overloads are hard. This uses SFINAE to get the desired behavior, and includes a test. This also removes a hack in ExceptionWrapper which isn't needed with this fix. Test Plan: string_test, exception_wrapper_test Reviewed By: andrei.alexandrescu@fb.com Subscribers: dreiss, dancol, njormrod FB internal diff: D1535681 Blame Revision: D1517701
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