backend: Don't process FAKE_OVERRIDE properties in lateinit lowering

backend.native/tests/build.gradle

@@ -829,6 +829,11 @@ task lateinit_notInitialized(type: RunKonanTest) {
     source = "codegen/lateinit/notInitialized.kt"
 }
 
+task lateinit_inBaseClass(type: RunKonanTest) {
+    goldValue = "42\n"
+    source = "codegen/lateinit/inBaseClass.kt"
+}
+
 task coroutines_simple(type: RunKonanTest) {
     goldValue = "42\n"
     source = "codegen/coroutines/simple.kt"

backend.native/tests/codegen/lateinit/inBaseClass.kt

@@ -0,0 +1,15 @@
+class A(val a: Int)
+
+open class B {
+    lateinit var a: A
+}
+
+class C: B() {
+    fun foo() { a = A(42) }
+}
+
+fun main(args: Array<String>) {
+    val c = C()
+    c.foo()
+    println(c.a.a)
+}