Handle @typedef with type on wrong side

**TypeScript Version:**  nightly (2.5.0-dev.20170629)

**Code**

```js
// @ts-check

/** @typedef Foo {number} */

/** @type {Foo} */
const x = "";
```

**Expected behavior:**

Either a syntax error, or correctly set `Foo = number` and have a type error.

**Actual behavior:**

No error.