Optimize @@species based on a global 'protector' cell

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 540c2ec173b48c106be42cb7825d999147b2f71d..eeae8d53921444b933a8c989aabb2d42956cb4fa 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -2851,6 +2851,10 @@ void Heap::CreateInitialObjects() {
   cell->set_value(the_hole_value());
   set_empty_property_cell(*cell);
 
+  Handle<PropertyCell> species_cell = factory->NewPropertyCell();
+  species_cell->set_value(Smi::FromInt(Isolate::kArrayProtectorValid));
+  set_species_protector(*species_cell);
+
   set_weak_stack_trace_list(Smi::FromInt(0));
 
   set_noscript_shared_function_infos(Smi::FromInt(0));