[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/isolate-inl.h

Index: src/isolate-inl.h
diff --git a/src/isolate-inl.h b/src/isolate-inl.h
index 34c98bba645a5a44253689b954abc9370b550209..498e16423459eadfe4d2ff81cf89ec0b29e2adba 100644
--- a/src/isolate-inl.h
+++ b/src/isolate-inl.h
@@ -143,6 +143,11 @@ bool Isolate::IsStringLengthOverflowIntact() {
   return has_instance_cell->value() == Smi::FromInt(kArrayProtectorValid);
 }
 
+bool Isolate::CanInlineArrayIterator() {
+  PropertyCell* array_iterator_cell = heap()->array_iterator_protector();
+  return array_iterator_cell->value() == Smi::FromInt(kArrayProtectorValid);
+}
+
 }  // namespace internal
 }  // namespace v8