[Bug c/95379] Don't warn about the universal zero initializer for a structure with the 'designated_init' attribute.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95379

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Why not just use { .foo = 0 }; instead?

Also this attribute is model after sparse's attribute, does sparse implement
what you are asking (https://sparse.wiki.kernel.org/index.php/Main_Page)?

Reference:
https://gcc.gnu.org/legacy-ml/gcc-patches/2014-01/msg01284.html