[runtime] Avoid @@isConcatSpreadable lookup for fast path Array.prototype.concat

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index a2daab0925c8aed2c30842bf041bdf4583d60bdd..667134fc62c6c4cb92aa07f8f8cb378437fed82c 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1242,7 +1242,7 @@ void Heap::ClearNormalizedMapCaches() {
     if (!cache->IsUndefined()) {
       NormalizedMapCache::cast(cache)->Clear();
     }
-    context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK);
+    context = Context::cast(context)->next_context_link();
   }
 }
 
@@ -2878,8 +2878,12 @@ 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));
+  Handle<Cell> is_concat_spreadable_cell = factory->NewCell(
+      handle(Smi::FromInt(Isolate::kArrayProtectorValid), isolate()));
+  set_array_is_concat_spreadable_protector(*is_concat_spreadable_cell);
+
+  Handle<Cell> species_cell = factory->NewCell(
+      handle(Smi::FromInt(Isolate::kArrayProtectorValid), isolate()));
   set_species_protector(*species_cell);
 
   set_weak_stack_trace_list(Smi::FromInt(0));