Make top-level property backing field private in bytecode

compiler/testData/codegen/boxWithStdlib/topLevelPrivate/privateVisibility.kt

@@ -0,0 +1,18 @@
+// FULL_JDK
+package test
+
+import java.lang.reflect.Modifier
+import kotlin.test.assertTrue
+
+
+private val prop = "O"
+
+private fun test() = "K"
+
+fun box(): String {
+    val clazz = Class.forName("test.PrivateVisibilityKt")
+    assertTrue(Modifier.isPrivate(clazz.getDeclaredMethod("test").modifiers), "Private top level function should be private")
+    assertTrue(Modifier.isPrivate(clazz.getDeclaredField("prop").modifiers), "Backing field for private top level property should be private")
+
+    return "OK"
+}