Added tests

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

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