[Bug tree-optimization/114092] ADD_OVERFLOW with resulting type of `_Complex unsigned:1` should be reduced to just `(unsigned)(a) <= 1`

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114092

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I should note that LLVM (LLVM does not have __builtin_add_overflow_p) is able
to optimize:
```
_Bool f2(int a, struct d b, unsigned _BitInt(1) t)
{
        return __builtin_add_overflow(a, 0, &t);
}
```
into  f1.