Added tests

backend.native/tests/codegen/propertyCallableReference/valExtension.kt

@@ -0,0 +1,13 @@
+class A(y: Int) {
+    var x = y
+}
+
+val A.z get() = this.x
+
+fun main(args: Array<String>) {
+    val p1 = A::z
+    println(p1.get(A(42)))
+    val a = A(117)
+    val p2 = a::z
+    println(p2.get())
+}