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

[rguenth at gcc dot gnu.org]

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

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
struct A { unsigned char a[256]; } __seg_gs a;
struct A __seg_gs b;

void foo (struct A x)
{
  a = x;
  b = a;
}

works at least, so it seems only the setmem path is affected in generic code
(still about to fix loop distribution).