Simplify, speed-up correct-context ObjectObserve calls

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 350 matching lines @@
 function ObjectObserve(object, callback, acceptList) {
   if (!IS_SPEC_OBJECT(object))
     throw MakeTypeError("observe_non_object", ["observe"]);
   if (%IsJSGlobalProxy(object))
     throw MakeTypeError("observe_global_proxy", ["observe"]);
   if (!IS_SPEC_FUNCTION(callback))
     throw MakeTypeError("observe_non_function", ["observe"]);
   if (ObjectIsFrozen(callback))
     throw MakeTypeError("observe_callback_frozen");
 
-  return %ObjectObserveInObjectContext(object, callback, acceptList);
+  var objectObserveFn = %GetObjectContextObjectObserve(object);
+  return objectObserveFn(object, callback, acceptList);
 }
 
 function NativeObjectObserve(object, callback, acceptList) {
   var objectInfo = ObjectInfoGetOrCreate(object);
   var typeList = ConvertAcceptListToTypeMap(acceptList);
   ObjectInfoAddObserver(objectInfo, callback, typeList);
   return object;
 }
 
 function ObjectUnobserve(object, callback) {
@@ skipping 154 matching lines @@
     throw MakeTypeError("called_on_non_object", ["performChange"]);
 
   var objectInfo = ObjectInfoGetFromNotifier(this);
   if (IS_UNDEFINED(objectInfo))
     throw MakeTypeError("observe_notify_non_notifier");
   if (!IS_STRING(changeType))
     throw MakeTypeError("observe_perform_non_string");
   if (!IS_SPEC_FUNCTION(changeFn))
     throw MakeTypeError("observe_perform_non_function");
 
-  return %ObjectNotifierPerformChangeInObjectContext(
-      objectInfo, changeType, changeFn);
+  var performChangeFn = %GetObjectContextNotifierPerformChange(objectInfo);
+  performChangeFn(objectInfo, changeType, changeFn);
 }
 
 function NativeObjectNotifierPerformChange(objectInfo, changeType, changeFn) {
   ObjectInfoAddPerformingType(objectInfo, changeType);
 
   var changeRecord;
   try {
     changeRecord = %_CallFunction(UNDEFINED, changeFn);
   } finally {
     ObjectInfoRemovePerformingType(objectInfo, changeType);
   }
 
   if (IS_SPEC_OBJECT(changeRecord))
     ObjectInfoEnqueueExternalChangeRecord(objectInfo, changeRecord, changeType);
 }
 
 function ObjectGetNotifier(object) {
   if (!IS_SPEC_OBJECT(object))
     throw MakeTypeError("observe_non_object", ["getNotifier"]);
   if (%IsJSGlobalProxy(object))
     throw MakeTypeError("observe_global_proxy", ["getNotifier"]);
 
   if (ObjectIsFrozen(object)) return null;
 
   if (!%ObjectWasCreatedInCurrentOrigin(object)) return null;
 
-  return %ObjectGetNotifierInObjectContext(object);
+  var getNotifierFn = %GetObjectContextObjectGetNotifier(object);
+  return getNotifierFn(object);
 }
 
 function NativeObjectGetNotifier(object) {
   var objectInfo = ObjectInfoGetOrCreate(object);
   return ObjectInfoGetNotifier(objectInfo);
 }
 
 function CallbackDeliverPending(callback) {
   var callbackInfo = GetCallbackInfoMap().get(callback);
   if (IS_UNDEFINED(callbackInfo) || IS_NUMBER(callbackInfo))
@@ skipping 45 matching lines @@
     "observe", ArrayObserve,
     "unobserve", ArrayUnobserve
   ));
   InstallFunctions(notifierPrototype, DONT_ENUM, $Array(
     "notify", ObjectNotifierNotify,
     "performChange", ObjectNotifierPerformChange
   ));
 }
 
 SetupObjectObserve();