Test refactoring

compiler/testData/diagnostics/tests/smartCasts/publicVals/open.kt

@@ -0,0 +1,11 @@
+public open class A() {
+    public open val foo: Int? = 1
+}
+
+fun Int.bar(i: Int) = i
+
+fun test() {
+    val p = A()
+    // For open value properties, smart casts should not work
+    if (p.foo is Int) <!SMARTCAST_IMPOSSIBLE!>p.foo<!> bar 11
+}