[Bug c++/92869] [10 Regression] C++17 wrongly reports aggregate type as not-aggregate (when explicitly defaulted ctors are added)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92869

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And the
template <typename T, __SIZE_TYPE__ N>
struct A {
  A() = default;
  A(const A &) = default;
  A(A &&) = default;
  T arr[N];   
};

int main()
{
  if (!__is_aggregate (A<int,3>))
    __builtin_abort ();
}
testcase reduced from #c0 too.