[Bug c/71983] "error: initializer element is not constant" only with -O0

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71983

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is not valid C code.  Now GCC should be consistent at different
optimization levels.