[Bug middle-end/118643] [15 Regression] Crash at -O3 during RTL pass: expand since r15-7171

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118643

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Simplified testcase from the duplicate bug report:
```
typedef __attribute__((__vector_size__(1))) unsigned char V;

V
foo(V v)
{
  return *(V *)(&v - 1);
}
```