[Bug ipa/82801] Internal compiler error with Eigen and __attribute__((always_inline, flatten))

[awllee at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82801

--- Comment #1 from Anthony Lee <awllee at gmail dot com> ---
creduce reduces this to the below. However, I'm not sure this is the reason for
the original ICE since the error goes away if one writes inline double
B::m_fn1() const { ... }

template<int>
class A {
public:
  A() {}
};

class B {
  double m_fn1() const;
};

__attribute__((always_inline, flatten))
double B::m_fn1() const {
  A<1> v;
  return 0.0;
}

int main() { }