Merge public static API of non-public base supertypes into public subtype

libraries/tools/binary-compatibility-validator/src/test/kotlin/cases/java/Facade.java

@@ -2,10 +2,11 @@ package cases.java;
 
 class Part1 {
     public static void publicMethod(String param) { }
+
+    public static class Part2 extends Part1 {
+        public static void publicMethod(int param) { }
+    }
 }
 
-class Part2 extends Part1 {
-    public static void publicMethod(int param) { }
-}
 
-public class Facade extends Part2 { }
+public class Facade extends Part1.Part2 { }