Old-style octal literal types are treated as decimal literal types

``` ts
// @target: es3
const i: 010 = 8;
```

Actual:

```ts
const i: 010 = 8;
      ~
      Error: Type '8' is not assignable to type '10';
```


Expected:

```ts
const i: 010 = 8;
         ~~~
         Error: Octal literal types must use ES2015 syntax. Use the syntax '0o10'.
```
