[Bug tree-optimization/115009] [15 regression] AVR: ICE in alloc, at value-range-storage.cc:598

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115009

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
```
void
pgm_copystring(const char __memx * p)
{
    unsigned char c;
    c = *p;
}

```