Extra test with smart cast to 'T'

compiler/testData/codegen/box/smartCasts/genericSet.kt

@@ -0,0 +1,13 @@
+class Wrapper<T>(var x: T)
+
+inline fun <reified T> change(w: Wrapper<T>, x: Any?) {
+    if (x is T) {
+        w.x = x
+    }
+}
+
+fun box(): String {
+    val w = Wrapper<String>("FAIL")
+    change(w, "OK")
+    return w.x
+}