[Bug target/68355] C++ constexpr is passed on stack

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68355
Bug 68355 depends on bug 60336, which changed state.

Bug 60336 Summary: empty struct value is passed differently in C and C++
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60336

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED