Codegen tests for lateinit var with private setter

compiler/testData/codegen/box/properties/lateinit/privateSetter.kt

@@ -0,0 +1,12 @@
+class My {
+    lateinit var x: String
+        private set
+
+    fun init() { x = "OK" }
+}
+
+fun box(): String {
+    val my = My()
+    my.init()
+    return my.x
+}

compiler/testData/codegen/box/properties/lateinit/privateSetterFromLambda.kt

@@ -0,0 +1,12 @@
+class My {
+    lateinit var x: String
+        private set
+
+    fun init(arg: String, f: (String) -> String) { x = f(arg) }
+}
+
+fun box(): String {
+    val my = My()
+    my.init("O") { it + "K" }
+    return my.x
+}