[ESnext] Implement Promise.prototype.finally

src/objects-printer.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/objects.h"
 
 #include <iomanip>
 #include <memory>
 
 #include "src/bootstrapper.h"
@@ skipping 482 matching lines @@
 void JSPromise::JSPromisePrint(std::ostream& os) {  // NOLINT
   JSObjectPrintHeader(os, this, "JSPromise");
   os << "\n - status = " << JSPromise::Status(status());
   os << "\n - result = " << Brief(result());
   os << "\n - deferred_promise: " << Brief(deferred_promise());
   os << "\n - deferred_on_resolve: " << Brief(deferred_on_resolve());
   os << "\n - deferred_on_reject: " << Brief(deferred_on_reject());
   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
   JSObjectPrintHeader(os, this, "JSRegExp");
   os << "\n - data = " << Brief(data());
   JSObjectPrintBody(os, this);
 }
 
 
 void Symbol::SymbolPrint(std::ostream& os) {  // NOLINT
@@ skipping 1178 matching lines @@
     printf("Not a transition array\n");
   } else {
     reinterpret_cast<i::TransitionArray*>(object)->Print();
   }
 }
 
 extern void _v8_internal_Print_StackTrace() {
   i::Isolate* isolate = i::Isolate::Current();
   isolate->PrintStack(stdout);
 }