JS: fix class literal expression with primitive classes. See KT-16545

js/js.libraries/src/js/long.js

@@ -64,6 +64,12 @@ Kotlin.Long = function(low, high) {
   this.high_ = high | 0;  // force into 32 signed bits.
 };
 
+Kotlin.Long.$metadata$ = {
+    kind: "class",
+    simpleName: "Long",
+    interfaces:[]
+};
+
 
 // NOTE: Common constant values ZERO, ONE, NEG_ONE, etc. are defined below the
 // from* methods on which they depend.

js/js.libraries/src/reflect/JsClass.kt

@@ -35,7 +35,12 @@ external fun <T : Any> jsClass(): JsClass<T>
 
 @Deprecated("Use class literal and extension property `js` instead.", replaceWith = ReplaceWith("this::class.js"), level = DeprecationLevel.WARNING)
 val <T : Any> T.jsClass: JsClass<T>
-    get() = js("Object").getPrototypeOf(this).constructor
+    get() = when (jsTypeOf(this)) {
+        "string" -> js("String")
+        "number" -> js("Number")
+        "boolean" -> js("Boolean")
+        else -> js("Object").getPrototypeOf(this).constructor
+    }
 
 /**
  * Obtains a constructor reference for the given `KClass`.