KtEnumEntry, a subtype of KtClass, has been handled by
findNonLocalClass. Since KtEnumEntry doesn't have class id, that util
always throws an error while retrieving class id.
Instead, we should use containing class (i.e., enum class) id.
Also, once the enum class is resolved, we should search for matching
enum entry inside the enum class.
Consider the following code:
```
fun test(a: List<String>) {
a.first()
}
```
The dispatch receiver type of `first` in this case is `List<T>` before
this change. After this change, it's `List<String>`.
In addition, this change also replace the dispatch receiver type with
the more specific type if available. For example, consider the following
```
class MyList: ArrayList<String>()
fun test(a: MyList) {
a.get(0)
}
```
The dispatch receiver type of `get` is `MyList`, instead of
`ArrayList<String>`. That is, a fake override is created in this case.
Kristoffer Andersen