[Bug tree-optimization/41244] "&data[i] - data" isn't converted to "i"

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41244

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here are some better testcases as the power of 2 case can be handled on the rtl
level as it is just a shift.

extern struct s{
 int a, b, c, d, e, f, g, h;
}  data[];

int find(int i, int j)
{
  struct s *a = &data[i];
  struct s *b = &data[j];
  return a - b;
}


extern struct {
 int a, b, c;
}  data1[];

int find1(int i, int j)
{
  return &data1[i] - data1;
}