Report Syntax Errors in JSDocs Type Annotations

From https://github.com/Microsoft/vscode/issues/18229

**TypeScript Version:**  2.2.0-dev.20170109

**Code**
In a JS file:

```ts
/**
 * @param {(x)=>void} x 
 **/
function foo(x) { }
```

**Expected behavior:**
Reports a syntax error when trying to parse the JSDoc type annotation 

**Actual behavior:**
No error reported. `x` has `any` type
