fix double nested peer result locations

```zig
export fn entry(x: bool) i32 {
    return if (x)
        if (x) a else b
    else
        if (x) c else d;
}
```
cdf14baa45Andrew Kelley committed on 6/13/2019, 1:46:04 AMparent0d62c92
2 files changedLine totals unavailable