JS: when RHS of as cast is non-nullable native interface, check LHS for null

js/js.translator/testData/box/native/castToNativeInterfaceChecked.kt

@@ -0,0 +1,15 @@
+@native interface I {
+    fun foo(): String
+}
+
+fun createObject(): Any? = null
+
+fun box(): String {
+    try {
+        (createObject() as I).foo()
+        return "fail: exception not thrown"
+    }
+    catch (e: ClassCastException) {
+        return "OK"
+    }
+}

js/js.translator/testData/box/native/castToNullableNativeInterface.kt

@@ -0,0 +1,10 @@
+@native interface I {
+    fun foo(): String
+}
+
+fun createObject(): Any? = null
+
+fun box(): String {
+    val result = (createObject() as I?)?.foo()
+    return if (result == null) "OK" else "fail"
+}

js/js.translator/testData/box/native/nativeClassAsReifiedTypeArgument.kt

@@ -2,8 +2,8 @@
 
 var global = ""
 
-inline fun <reified T> log(x: T) {
-    global += jsClass<T>().name + ": " + x
+inline fun <reified T : Any> log(x: T) {
+    global += T::class.js.name + ": " + x
 }
 
 @native class C {

js/js.translator/testData/box/native/safeCastToNativeInterface.kt

@@ -0,0 +1,9 @@
+@native interface I {
+    fun foo(): String
+}
+fun createObject(): Any? = null
+
+fun box(): String {
+    val result = (createObject() as? I)?.foo()
+    return if (result == null) "OK" else "fail"
+}