[Bug tree-optimization/91901] unchanged stack array not optimized away in favor of constant pool entry

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91901

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
With https://forge.sourceware.org/gcc/gcc-TEST/pulls/64 we get:
```
__attribute__((nodiscard))
struct string_view
magic_enum::detail::_ZN10magic_enum6detail4nameI1EEESt17basic_string_viewIcSt11char_traitsIcEET_.part.0<E>
(E value)
{
  struct string_view D.27695;
  long unsigned int i;
  int _2;

  <bb 2> [local count: 536870912]:
  _2 = value_1(D) + 128;
  i_3 = (long unsigned int) _2;
  D.27695 = MEM <const struct array> [(const struct basic_string_view
&)&*.LC0]._M_elems[i_3];
  return D.27695;

}
```

But the reason why this is not inlined is a different story ...