Exclude nested classes of private classes from ABI classes

plugins/jvm-abi-gen/testData/compare/innerClasses/base/classes.kt

@@ -0,0 +1,31 @@
+package test
+
+class A {
+    private inner class AInner {
+        inner class AInnerInner {}
+
+        fun aInnerMethod() {
+            class AInnerMethodLocal
+
+            val aInnerMethodLambda: (Int) -> Int = { it * it }
+        }
+    }
+
+    private class ANested {
+        inner class ANestedInner {}
+        class ANestedNested
+        object ANestedObject
+
+        fun aNestedMethod() {
+            class ANestedMethodLocal
+
+            val aNestedMethodLambda: (Int) -> Int = { it * it }
+        }
+    }
+}
+
+private class B {
+    inner class BInnerClass
+    class BNestedClass
+    object BObject {}
+}

plugins/jvm-abi-gen/testData/compare/innerClasses/sameAbi/classes.kt

@@ -0,0 +1,3 @@
+package test
+
+class A