Excess object literals property checking fails when the literal includes a spread

Excess object literal property checking fails when the literal includes a spread.

```ts
let x = { b: 1, extra: 2 }
let xx: { a, b }  = { a: 1, ...x, z: 3 } // error for 'z', no error for 'extra'
```

Actual: No Error

Expected:
Error for 'z', no error for 'extra'