[OpenMP] crash on invalid C++ code

[k-arrows]

Reproducer:
https://godbolt.org/z/4vscKvhW9

template <typename T>
class I { };
struct R { R () {}; ~R () {}; I<int> r; };
struct T { T () {}; virtual ~T () {}; I<int> t; };
struct A : public R, virtual public T { A () {} I<int> a; void m1 (const I<int> &, const I<int> &); };

void A::m1 (const I<int> &x)
{
  int w = 0;
  #pragma omp parallel for reduction(|:w)
  for (a = x; A::a < 10; a++)
    w |= (1 << *A::a);
}

[AaronBallman]

Smaller reproducer:

class I { };
struct A { I a; void m1(); };

void A::m1(const I &x) {
  int w = 0;
  #pragma omp parallel for reduction(|:w)
  for (a = x; a < 10; a++)
    ;
}