Generate super classes and overridden functions in proper scope

Such references require proper scope so that local symbols are bound.
Example:

```
fun <T> outer() {
    abstract class ALocal<S : T> {
        abstract fun bar()
    }

    class Local<S : T> : ALocal<S>() {
        override fun bar() {}
    }
}
```

Here local classes have type parameters with upper bounds depending on
function type parameters, and members overriding members in other local
classes.

compiler/testData/ir/irText/declarations/fakeOverrides.txt

@@ -44,6 +44,8 @@ FILE fqName:<root> fileName:/fakeOverrides.kt
     superClasses:
       CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:Any modality:OPEN visibility:public flags:
     TYPE_PARAMETER name:T index:0 variance: upperBounds:[kotlin.Any?]
+      superClassifiers:
+        CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:Any modality:OPEN visibility:public flags:
     CONSTRUCTOR visibility:public <> () returnType:CFoo<T> flags:
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'constructor Any()'