[test] Don't run JS-specific irText tests against other backends

compiler/testData/ir/irText/js/native/nativeNativeKotlin.kt

@@ -1,3 +1,4 @@
+// TARGET_BACKEND: JS_IR
 // FILE: nativeNativeKotlin.kt
 
 package foo
@@ -36,4 +37,4 @@ B.prototype.constructor = B;
 
 B.prototype.bar = function () {
     return "B.bar"
-};
+};