[Bug rtl-optimization/59311] [4.9 Regression] LRA fails to update REG_CFA_SET_VDRAP note

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59311

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
A small testcase compiled with -std=c++1y -m32:

--
namespace std
{
  typedef long unsigned int size_t;
}
namespace std
{
  template<class _E>
    class initializer_list
    {
    public:
      typedef size_t size_type;
      typedef const _E* iterator;
      typedef const _E* const_iterator;
    private:
      iterator _M_array;
      size_type _M_len;
      constexpr initializer_list(const_iterator __a, size_type __l)
      : _M_array(__a), _M_len(__l) { }
    };
}
struct A
{
  int i;
  A(std::initializer_list<int>) { }
  A(int i): i{i} { }
};
int x = 4;
int main(int argc, char **argv)
{
  { int i[x] = { 42, 42, 42, 42 }; }
  {
    A a[x] = { argc };
    if (a[1].i != 42)
      __builtin_abort ();
  }
}
---