[Isolates] Avoid dereferencing Isolate::Current() to check oddball identities...

src/accessors.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 21 matching lines @@
 #include "factory.h"
 #include "scopeinfo.h"
 
 namespace v8 {
 namespace internal {
 
 
 template <class C>
 static C* FindInPrototypeChain(Object* obj, bool* found_it) {
   ASSERT(!*found_it);
+  Heap* heap = HEAP;
   while (!Is<C>(obj)) {
-    if (obj == HEAP->null_value()) return NULL;
+    if (obj == heap->null_value()) return NULL;
     obj = obj->GetPrototype();
   }
   *found_it = true;
   return C::cast(obj);
 }
 
 
 // Entry point that never should be called.
 Object* Accessors::IllegalSetter(JSObject*, Object*, void*) {
   UNREACHABLE();
@@ skipping 598 matching lines @@
 }
 
 
 const AccessorDescriptor Accessors::ObjectPrototype = {
   ObjectGetPrototype,
   ObjectSetPrototype,
   0
 };
 
 } }  // namespace v8::internal