Fastpath some spread-call desugaring.

src/lookup.cc

Index: src/lookup.cc
diff --git a/src/lookup.cc b/src/lookup.cc
index 98aab68c6d94e345f7925cdf5d5a086b669cbf9d..a99856f8dedb0b0a5cc7904005890a981018cf97 100644
--- a/src/lookup.cc
+++ b/src/lookup.cc
@@ -194,6 +194,11 @@ void LookupIterator::InternalUpdateProtector() {
   } else if (*name_ == heap()->has_instance_symbol()) {
     if (!isolate_->IsHasInstanceLookupChainIntact()) return;
     isolate_->InvalidateHasInstanceProtector();
+  } else if (*name_ == heap()->iterator_symbol()) {
+    if (!isolate_->IsArrayIteratorLookupChainIntact()) return;
+    if (holder_->IsJSArray()) {
+      isolate_->InvalidateArrayIteratorProtector();
+    }
   }
 }