Store JSGlobalProxy's identity hash directly on the proxy itself

src/bootstrapper.cc

 // Copyright 2014 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.
 
 #include "bootstrapper.h"
 
 #include "accessors.h"
 #include "isolate-inl.h"
 #include "natives.h"
 #include "snapshot.h"
@@ skipping 751 matching lines @@
   }
 
   Handle<String> global_name = factory()->InternalizeOneByteString(
       STATIC_ASCII_VECTOR("global"));
   global_proxy_function->shared()->set_instance_class_name(*global_name);
   global_proxy_function->initial_map()->set_is_access_check_needed(true);
 
   // Set global_proxy.__proto__ to js_global after ConfigureGlobalObjects
   // Return the global proxy.
 
+  Handle<JSGlobalProxy> global_proxy;
   if (global_object.location() != NULL) {
     ASSERT(global_object->IsJSGlobalProxy());
-    Handle<JSGlobalProxy> global_proxy =
-        Handle<JSGlobalProxy>::cast(global_object);
+    global_proxy = Handle<JSGlobalProxy>::cast(global_object);
     factory()->ReinitializeJSGlobalProxy(global_proxy, global_proxy_function);
-    return global_proxy;
   } else {
-    return Handle<JSGlobalProxy>::cast(
+    global_proxy = Handle<JSGlobalProxy>::cast(
         factory()->NewJSObject(global_proxy_function, TENURED));
+    global_proxy->set_hash(heap()->undefined_value());
   }
+  return global_proxy;
 }
 
 
 void Genesis::HookUpGlobalProxy(Handle<GlobalObject> inner_global,
                                 Handle<JSGlobalProxy> global_proxy) {
   // Set the native context for the global object.
   inner_global->set_native_context(*native_context());
   inner_global->set_global_context(*native_context());
   inner_global->set_global_receiver(*global_proxy);
   global_proxy->set_native_context(*native_context());
@@ skipping 1905 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   ASSERT(!IsActive());
 }
 
 } }  // namespace v8::internal