[Bug tree-optimization/115694] ICE when building scipy with LTO

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115694

--- Comment #6 from Sam James <sjames at gcc dot gnu.org> ---
Bit more.

meson-generated_cython_special.c.i:
```
_Complex a;
void special_cairye();
void b() { special_cairye(a); }
```

special_wrappers.cpp.ii:
```
typedef struct {
  double a[2];
} b;
extern "C" void special_cairye(b);
 __attribute__((visibility("hidden"))) void c(b);
 __attribute__((visibility("hidden"))) void special_cairye(b d) { c(d); }
```

And just:
```
gcc meson-generated_cython_special.c.i special_wrappers.cpp.ii -shared -O1
-flto
```