Speed up the LookupIterator

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index ddca0d616be838700b73a45c09f73480d3caaccf..f40a9cf4f0b7d8a79bea71edb9ad66b509ede810 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1961,6 +1961,8 @@ int JSObject::GetHeaderSize(InstanceType type) {
   // field operations considerably on average.
   if (type == JS_OBJECT_TYPE) return JSObject::kHeaderSize;
   switch (type) {
+    case JS_SPECIAL_API_OBJECT_TYPE:
+      return JSObject::kHeaderSize;
     case JS_GENERATOR_OBJECT_TYPE:
       return JSGeneratorObject::kSize;
     case JS_MODULE_TYPE: