Implement header size calculation for array iterators.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index e3b47427e38251435c4d4ab36f7498d7ec34029b..e3b0c8efe700816979f7a7c6aece22ba39874832 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2165,6 +2165,10 @@ int JSObject::GetHeaderSize(InstanceType type) {
     case JS_MODULE_NAMESPACE_TYPE:
       return JSModuleNamespace::kSize;
     default:
+      if (type >= FIRST_ARRAY_ITERATOR_TYPE &&
+          type <= LAST_ARRAY_ITERATOR_TYPE) {
+        return JSArrayIterator::kSize;
+      }
       UNREACHABLE();
       return 0;
   }