[ESnext] Implement Promise.prototype.finally

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index dfeb3cb8ef7e71c0b95d4a791320a59ae69fa82b..53c35e9c639d5255c545b7b6819fb19d41a25c5d 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -500,6 +500,7 @@ void JSPromise::JSPromisePrint(std::ostream& os) {  // NOLINT
   os << "\n - fulfill_reactions = " << Brief(fulfill_reactions());
   os << "\n - reject_reactions = " << Brief(reject_reactions());
   os << "\n - has_handler = " << has_handler();
+  os << "\n ";
 }
 
 void JSRegExp::JSRegExpPrint(std::ostream& os) {  // NOLINT