[FIR] Don't generated fake-overrides for private declarations of actualized super classes

^KT-58252 Fixed

compiler/testData/codegen/box/multiplatform/k2/anonymousObjectAndSpecificImplementationInDeserializedIr.kt

@@ -0,0 +1,34 @@
+// LANGUAGE: +MultiPlatformProjects
+// WITH_STDLIB
+// IGNORE_BACKEND_K1: JS, JS_IR, JS_IR_ES6
+//   JS tests don't support MPP modules compilation
+// ISSUE: KT-58252
+
+// MODULE: lib-common
+// FILE: common.kt
+
+package foo
+
+interface Base<T : Any> {
+    val capacity: Int
+}
+
+expect abstract class Derived<T : Any>(capacity: Int) : Base<T> {
+    final override val capacity: Int
+}
+
+internal val ByteArrayPool = object : Derived<ByteArray>(128) {}
+
+// MODULE: lib()()(lib-common)
+// FILE: platform.kt
+
+package foo
+
+actual abstract class Derived<T : Any>
+actual constructor(actual final override val capacity: Int) : Base<T> {
+    private val instances = arrayOfNulls<Any?>(capacity)
+}
+
+fun box(): String {
+    return if (ByteArrayPool.capacity == 128) "OK" else "Error: ${ByteArrayPool.capacity}"
+}