Additional loadJava/loadKotlin tests for nested classes

#KT-1174 Fixed

compiler/testData/loadKotlin/class/NestedClassExtendNestedClass.txt

@@ -0,0 +1,13 @@
+package test
+
+internal final class Outer {
+    /*primary*/ public constructor Outer()
+    
+    internal open class Nested1 {
+        /*primary*/ public constructor Nested1()
+    }
+    
+    internal final class Nested2 : test.Outer.Nested1 {
+        /*primary*/ public constructor Nested2()
+    }
+}