[Bug c++/86908] static_cast(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86908

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This makes the program correct:

    strategyPtr = new(&strategy) AStrategy;
    static_cast<BaseStrategy*>(std::launder(&strategy))->doIt();
    strategyPtr->doIt();