[Bug c++/70259] [6 Regression] -flifetime-dse=2 bug with empty bases

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70259

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Another reproducer:

struct Empty { };
struct A { A() : a(true) { } bool a; };
struct B : Empty { B() : Empty() { } };
struct C : A, B { C() : A(), B() { } };
int main() {
  C c;
  if ( c.a == false )
    __builtin_abort();
};