Becuase of cross-context calls, hydrogen-based Array constructor needs to ensure

src/heap.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 4322 matching lines @@
   // Allocate the object based on the constructors initial map, or the payload
   // advice
   Map* initial_map = constructor->initial_map();
 
   JSGlobalPropertyCell* cell = JSGlobalPropertyCell::cast(
       *allocation_site_info_payload);
   Smi* smi = Smi::cast(cell->value());
   ElementsKind to_kind = static_cast<ElementsKind>(smi->value());
   AllocationSiteMode mode = TRACK_ALLOCATION_SITE;
   if (to_kind != initial_map->elements_kind()) {
-    MaybeObject* maybe_new_map = constructor->GetElementsTransitionMap(
-        isolate(), to_kind);
+    MaybeObject* maybe_new_map = initial_map->AsElementsKind(to_kind);
     if (!maybe_new_map->To(&initial_map)) return maybe_new_map;
     // Possibly alter the mode, since we found an updated elements kind
     // in the type info cell.
     mode = AllocationSiteInfo::GetMode(to_kind);
   }
 
   MaybeObject* result;
   if (mode == TRACK_ALLOCATION_SITE) {
     result = AllocateJSObjectFromMapWithAllocationSite(initial_map,
         allocation_site_info_payload);
@@ skipping 3532 matching lines @@
   if (FLAG_parallel_recompilation) {
     heap_->relocation_mutex_->Lock();
 #ifdef DEBUG
     heap_->relocation_mutex_locked_by_optimizer_thread_ =
         heap_->isolate()->optimizing_compiler_thread()->IsOptimizerThread();
 #endif  // DEBUG
   }
 }
 
 } }  // namespace v8::internal