KT-7397: use reference comparison (===) when translating a is A, where A is an object. Use more sophisticated check for reified parameters.

js/js.translator/testData/kotlin_lib_ecma5.js

@@ -381,6 +381,15 @@
             return object instanceof klass;
         }
 
+        var proto = Object.getPrototypeOf(klass);
+        var constructor = proto != null ? proto.constructor : null;
+        if (constructor != null && "$metadata$" in constructor) {
+            var metadata = constructor.$metadata$;
+            if (metadata.type === Kotlin.TYPE.OBJECT) {
+                return object === klass;
+            }
+        }
+
         // In WebKit (JavaScriptCore) for some interfaces from DOM typeof returns "object", nevertheless they can be used in RHS of instanceof
         if (isNativeClass(klass)) {
             return object instanceof klass;

js/js.translator/testData/rtti/cases/isObject.kt

@@ -5,8 +5,7 @@ object Obj
 fun box(): String {
     val r: Any = Obj
 
-// TODO: fix KT-13465
-//    if (r !is Obj) return "r !is Obj"
+    if (r !is Obj) return "r !is Obj"
 
     return "OK"
 }

js/js.translator/testData/rtti/cases/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)
+}