[Bug tree-optimization/79649] Memset pattern in named address space crashes compiler or generates wrong code

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79649

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
typedef __SIZE_TYPE__ size_t;
struct A { int a; char b[1024]; };
extern struct A __seg_gs a;

void
f1 (size_t n)
{
  for (size_t i = 0; i < n; ++i)
    a.b[i] = 0;
}

certainly compiles fine with my patch.