Goto declaration for default import behaves differently

```
// x.ts
export default 0;
export const x = 0;
export const y = 0;

// index.ts
import df, {x, y as z} from "./x";
[df, x, z];
```

Starting from the last line of `index.ts`, goto-declaration on `x` and `z` each go directly to `x.ts`. But for `df` it goes to the import first, and one must goto-declaration again to get to `x.ts`.
