Change the size of the static foreach to arbitrarily explode compilation time when compiling with -O:

```
void f()
{
    for (int i = 0; i < 1; i++)
    {
        int j = 0;
        static foreach (k; 0 .. 1000)
            j++;
    }
}
```

The optimizer should stop trying to do quadratic time loop optimizations past a certain threshold.