Removed a bunch of GetExistingThreadLocal calls by threading the Isolate.

src/factory.cc

 // Copyright 2012 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 1349 matching lines @@
 Handle<Map> Factory::ObjectLiteralMapFromCache(Handle<Context> context,
                                                Handle<FixedArray> keys) {
   if (context->map_cache()->IsUndefined()) {
     // Allocate the new map cache for the native context.
     Handle<MapCache> new_cache = NewMapCache(24);
     context->set_map_cache(*new_cache);
   }
   // Check to see whether there is a matching element in the cache.
   Handle<MapCache> cache =
       Handle<MapCache>(MapCache::cast(context->map_cache()));
-  Handle<Object> result = Handle<Object>(cache->Lookup(*keys));
+  Handle<Object> result = Handle<Object>(cache->Lookup(*keys), isolate());
   if (result->IsMap()) return Handle<Map>::cast(result);
   // Create a new map and add it to the cache.
   Handle<Map> map =
       CopyMap(Handle<Map>(context->object_function()->initial_map()),
               keys->length());
   AddToMapCache(context, keys, map);
   return Handle<Map>(map);
 }
 
 
@@ skipping 31 matching lines @@
   regexp->set_data(*store);
 }
 
 
 
 void Factory::ConfigureInstance(Handle<FunctionTemplateInfo> desc,
                                 Handle<JSObject> instance,
                                 bool* pending_exception) {
   // Configure the instance by adding the properties specified by the
   // instance template.
-  Handle<Object> instance_template = Handle<Object>(desc->instance_template());
+  Handle<Object> instance_template(desc->instance_template(), isolate());
   if (!instance_template->IsUndefined()) {
     Execution::ConfigureInstance(instance,
                                  instance_template,
                                  pending_exception);
   } else {
     *pending_exception = false;
   }
 }
 
 
 Handle<Object> Factory::GlobalConstantFor(Handle<String> name) {
   Heap* h = isolate()->heap();
   if (name->Equals(h->undefined_symbol())) return undefined_value();
   if (name->Equals(h->nan_symbol())) return nan_value();
   if (name->Equals(h->infinity_symbol())) return infinity_value();
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return Handle<Object>(value
                         ? isolate()->heap()->true_value()
                         : isolate()->heap()->false_value());
 }
 
 
 } }  // namespace v8::internal