Fix more GC unsafe places

src/bootstrapper.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 1046 matching lines @@
   builtins->set_builtins(*builtins);
   builtins->set_global_context(*global_context());
   builtins->set_global_receiver(*builtins);
 
   // Setup the 'global' properties of the builtins object. The
   // 'global' property that refers to the global object is the only
   // way to get from code running in the builtins context to the
   // global object.
   static const PropertyAttributes attributes =
       static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE);
-  SetProperty(builtins, Factory::LookupAsciiSymbol("global"),
-              Handle<Object>(global_context()->global()), attributes);
+  Handle<String> global_symbol = Factory::LookupAsciiSymbol("global");
+  SetProperty(builtins,
+              global_symbol,
+              Handle<Object>(global_context()->global()),
+              attributes);
 
   // Setup the reference from the global object to the builtins object.
   JSGlobalObject::cast(global_context()->global())->set_builtins(*builtins);
 
   // Create a bridge function that has context in the global context.
   Handle<JSFunction> bridge =
       Factory::NewFunction(Factory::empty_symbol(), Factory::undefined_value());
   ASSERT(bridge->context() == *Top::global_context());
 
   // Allocate the builtins context.
@@ skipping 776 matching lines @@
 }
 
 
 // Restore statics that are thread local.
 char* BootstrapperActive::RestoreState(char* from) {
   nesting_ = *reinterpret_cast<int*>(from);
   return from + sizeof(nesting_);
 }
 
 } }  // namespace v8::internal