Rename import: left-hand side should not be a write access / definition

**TypeScript Version:**  nightly (2.2.0-dev.20170210)

**Code**

```ts
import { p as q }
```

**Expected behavior:**

`p` is not a write access or definition. `q` is.

**Actual behavior:**

Both are considered write accesses. See `findAllRefsReExports.ts` for an example (test added by #14001).