[Bug middle-end/120290] internal compiler error: in expand_asm_stmt, at cfgexpand.cc:3720

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120290

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced:
```
void f(int k){
    asm("" : " =r" (k)  : "0" (k));
}
```

The space in the output constraint is invalid and is causing the issue.