Implement inline %_IsJSProxy() for full codegen and Hydrogen

src/object-observe.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict";
 
 // Overview:
 //
 // This file contains all of the routing and accounting for Object.observe.
 // User code will interact with these mechanisms via the Object.observe APIs
@@ skipping 176 matching lines @@
 }
 
 function ObserverIsActive(observer, objectInfo) {
   return TypeMapIsDisjointFrom(ObjectInfoGetPerformingTypes(objectInfo),
                                ObserverGetAcceptTypes(observer));
 }
 
 function ObjectInfoGetOrCreate(object) {
   var objectInfo = ObjectInfoGet(object);
   if (IS_UNDEFINED(objectInfo)) {
-    if (!%IsJSProxy(object))
+    if (!%_IsJSProxy(object)) {
       %SetIsObserved(object);
-
+    }
     objectInfo = {
       object: object,
       changeObservers: null,
       notifier: null,
       performing: null,
       performingCount: 0,
     };
     GetObjectInfoMap().set(object, objectInfo);
   }
   return objectInfo;
@@ skipping 434 matching lines @@
     "observe", ArrayObserve,
     "unobserve", ArrayUnobserve
   ));
   InstallFunctions(notifierPrototype, DONT_ENUM, $Array(
     "notify", ObjectNotifierNotify,
     "performChange", ObjectNotifierPerformChange
   ));
 }
 
 SetupObjectObserve();