@ViewChild annotation behaves incorrectly on nested ngIf.

For example,

```
<div *ngIf="parentCondition">
  <div *ngIf="childCondition1" #testedComponent1>
  </div>

  <div *ngIf="childCondition2">
     <div  #testedComponent2>
     </div>
  </div>
</div>
```

@ViewChild('testedComponent2')
set component2(....)

The set function will not be called if childCondition2 changes.
