Elide hole checks on KeyedLoads of holey double arrays.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 6139080bfa340253474a791c60e3d0c7c475f787..bf2712d4abe6b83ae6c4f287ab4c3a4dd623a6ba 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -5177,15 +5177,8 @@ MaybeObject* Heap::AllocateJSArray(
   Context* native_context = isolate()->context()->native_context();
   JSFunction* array_function = native_context->array_function();
   Map* map = array_function->initial_map();
-  Object* maybe_map_array = native_context->js_array_maps();
-  if (!maybe_map_array->IsUndefined()) {
-    Object* maybe_transitioned_map =
-        FixedArray::cast(maybe_map_array)->get(elements_kind);
-    if (!maybe_transitioned_map->IsUndefined()) {
-      map = Map::cast(maybe_transitioned_map);
-    }
-  }
-
+  Map* transition_map = isolate()->get_initial_js_array_map(elements_kind);
+  if (transition_map != NULL) map = transition_map;
   return AllocateJSObjectFromMap(map, pretenure);
 }