Ensure newly allocated empty Arrays are transitioned to FAST_ELEMENT

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 5984834eaf35ebc98ab37c1f220cfbd3bf5b2657..0ec30baa5aecda8dcadfa73e58729e5b529b32c7 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -4434,6 +4434,8 @@ MaybeObject* Heap::AllocateGlobalContext() {
   }
   Context* context = reinterpret_cast<Context*>(result);
   context->set_map_no_write_barrier(global_context_map());
+  context->set_fast_array_element_bias(undefined_value());
+  context->set_untransitioned_js_array_map(undefined_value());
   ASSERT(context->IsGlobalContext());
   ASSERT(result->IsContext());
   return result;