[Bug tree-optimization/111090] Bogus -Wuninitialized for trivial copy of nested struct with partially initialized array

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111090

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced to make it obvious what is going on:
```
struct A {
    A() { buf[0] = 0; }
    int buf[2];
};
A g()
{
        A a;
        A b = a;
        return b;
}
```