[promises] cleanup default promise handlers

src/objects-debug.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 "src/bootstrapper.h"
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/field-type.h"
@@ skipping 904 matching lines @@
   CHECK(deferred_promise()->IsUndefined(isolate) ||
         deferred_promise()->IsJSReceiver() ||
         deferred_promise()->IsFixedArray());
   CHECK(deferred_on_resolve()->IsUndefined(isolate) ||
         deferred_on_resolve()->IsCallable() ||
         deferred_on_resolve()->IsFixedArray());
   CHECK(deferred_on_reject()->IsUndefined(isolate) ||
         deferred_on_reject()->IsCallable() ||
         deferred_on_reject()->IsFixedArray());
   CHECK(fulfill_reactions()->IsUndefined(isolate) ||
-        fulfill_reactions()->IsCallable() ||
+        fulfill_reactions()->IsCallable() || fulfill_reactions()->IsSymbol() ||
         fulfill_reactions()->IsFixedArray());
   CHECK(reject_reactions()->IsUndefined(isolate) ||
-        reject_reactions()->IsCallable() || reject_reactions()->IsFixedArray());
+        reject_reactions()->IsSymbol() || reject_reactions()->IsCallable() ||
+        reject_reactions()->IsFixedArray());
 }
 
 void JSRegExp::JSRegExpVerify() {
   JSObjectVerify();
   Isolate* isolate = GetIsolate();
   CHECK(data()->IsUndefined(isolate) || data()->IsFixedArray());
   switch (TypeTag()) {
     case JSRegExp::ATOM: {
       FixedArray* arr = FixedArray::cast(data());
       CHECK(arr->get(JSRegExp::kAtomPatternIndex)->IsString());
@@ skipping 105 matching lines @@
   CHECK(then()->IsJSReceiver());
   CHECK(resolve()->IsJSFunction());
   CHECK(reject()->IsJSFunction());
   CHECK(context()->IsContext());
 }
 
 void PromiseReactionJobInfo::PromiseReactionJobInfoVerify() {
   Isolate* isolate = GetIsolate();
   CHECK(IsPromiseReactionJobInfo());
   CHECK(value()->IsObject());
-  CHECK(tasks()->IsFixedArray() || tasks()->IsCallable());
+  CHECK(tasks()->IsFixedArray() || tasks()->IsCallable() ||
+        tasks()->IsSymbol());
   CHECK(deferred_promise()->IsUndefined(isolate) ||
         deferred_promise()->IsJSReceiver() ||
         deferred_promise()->IsFixedArray());
   CHECK(deferred_on_resolve()->IsUndefined(isolate) ||
         deferred_on_resolve()->IsCallable() ||
         deferred_on_resolve()->IsFixedArray());
   CHECK(deferred_on_reject()->IsUndefined(isolate) ||
         deferred_on_reject()->IsCallable() ||
         deferred_on_reject()->IsFixedArray());
   CHECK(context()->IsContext());
@@ skipping 497 matching lines @@
 
   // Both are done at the same time.
   CHECK_EQ(new_it.done(), old_it.done());
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8