JS: move RTTI tests to proper location

js/js.translator/testData/box/rtti/isReifiedObject.kt

@@ -0,0 +1,13 @@
+// NO_INLINE
+package foo
+
+object Obj
+
+private inline fun <reified T> check(a: Any): String {
+    return if (a is T) "OK" else "fail"
+}
+
+fun box(): String {
+    var x: Any = Obj
+    return check<Obj>(x)
+}