checkJs error for indirect JSDoc param tag

TypeScript Version: 2.6.0-dev.20171015

```js
// @ts-check

function Foo() {
    /**
     * @param {string} wat
     */
    this.bar = function(wat) {

    }
}
```

Expected: No error
Actual: `JSDoc '@param' tag has name 'wat', but there is no parameter with that name.`