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 { }

libraries/tools/binary-compatibility-validator/src/test/resources/output/cases/java.txt

@@ -1,4 +1,6 @@
-public class cases/java/Facade: cases/java/Part2
+public class cases/java/Facade
 public fun <init> ()V
+public static fun publicMethod (I)V
+public static fun publicMethod (Ljava/lang/String;)V
 ------------------