[Bug target/69846] empty struct value fails to pass properly

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69846

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For C++98, this is undefined code because dummy is not a POD.  For C++11, I
don't know if it is undefined or not.