4   virtual void f1() {}  in f1()  function
8   virtual void f1() {}  in f1()  function
12   void f1() override {}  in f1()  function
16   void f1() override {}  in f1()  function
20   void f1() override /* nofinal */ {}  in f1()  function
24   void f1() override final {}  in f1()  function
38   static_cast<Base1 *>(&d1)->f1(); //< Devirt Base1::f1 to Derived1::f1.  in t1()
46   static_cast<Base1 *>(&d2)->f1(); //< Devirt Base1::f1 to Derived2::f1.  in t2()
54   static_cast<Base2 *>(&d2)->f1(); //< Devirt Base2::f1 to Derived2::f1.  in t3()
66   static_cast<Base1 *>(badp)->f1(); //< No devirt, test 'badp isa Base1'.  in t4()
83   static_cast<Base1 *>(badp)->f1(); //< Devirt Base1::f1 to Derived4::f1.  in t5()