[SLC] add tests on private object

^KT-56441

compiler/testData/asJava/lightClasses/lightClassByFqName/PrivateObject.kt

@@ -0,0 +1,12 @@
+// one.PrivateObject
+package one
+
+private object PrivateObject {
+    var publicProperty = 4
+    internal var internalProperty = false
+    private var privateProperty = ""
+
+    fun publicFun() {}
+    internal fun internalFun() {}
+    private fun privateFun() {}
+}