[Bug c/46921] Lost side effect when struct initializer expression uses comma operator

[dave.pagan at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46921

--- Comment #4 from Dave Pagan <dave.pagan at oracle dot com> ---
Patch submitted for review:

https://gcc.gnu.org/ml/gcc-patches/2018-02/msg01471.html