Private setter is now forbidden for non-private late init variables

compiler/testData/diagnostics/tests/LateInit.kt

@@ -13,7 +13,7 @@ public abstract class A<T: Any, V: String?>(<!INAPPLICABLE_LATEINIT_MODIFIER_PRI
 
     public lateinit var e: String
         get
-        private set
+        <!PRIVATE_SETTER_ON_NON_PRIVATE_LATE_INIT_VAR!>private<!> set
 
     fun a() {
         <!WRONG_MODIFIER_TARGET!>lateinit<!> var <!UNUSED_VARIABLE!>a<!>: String

compiler/testData/diagnostics/tests/LateInitSetter.kt

@@ -0,0 +1,16 @@
+class My {
+
+    lateinit var x: String
+        <!PRIVATE_SETTER_ON_NON_PRIVATE_LATE_INIT_VAR!>private<!> set
+
+    lateinit var y: String
+        // Ok, non-private setter
+        internal set
+
+    lateinit protected var z: String
+        <!PRIVATE_SETTER_ON_NON_PRIVATE_LATE_INIT_VAR!>private<!> set
+
+    lateinit private var w: String
+        // Ok, private var
+        private set
+}

compiler/testData/diagnostics/tests/LateInitSetter.txt

@@ -0,0 +1,12 @@
+package
+
+public final class My {
+    public constructor My()
+    private final lateinit var w: kotlin.String
+    public final lateinit var x: kotlin.String
+    public final lateinit var y: kotlin.String
+    protected final lateinit var z: kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}