JS/RTTI. Fix build and tests

js/js.translator/testData/expression/cast/cases/reifiedToNotNull.kt

@@ -2,12 +2,12 @@ package foo
 
 // CHECK_NOT_CALLED: test
 
-trait A
+interface A
 
 class AImpl: A
 
 inline
-fun test<reified T>(x: Any?): T = x as T
+fun <reified T> test(x: Any?): T = x as T
 
 fun box(): String {
     var a: A = AImpl()
@@ -18,4 +18,4 @@ fun box(): String {
     failsClassCast("test(object{})") { test<A>(object{}) }
 
     return "OK"
-}
+}