Add missing member fix should work for missing function

**TypeScript Version:**  3.1.0-dev.20180804

**Code**

```ts
class C {}
new C().m();

f();

namespace N { export const x = 0; }
N.f();

import * as m from "./mod";
m.f();
```

**Expected behavior:**

Codefix for both `m()` and for every `f()`.

**Actual behavior:**

Codefix for only `m()`.