[promises] Refactor debug code

src/code-stub-assembler.cc

 // Copyright 2016 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/code-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 8340 matching lines @@
   StoreObjectFieldNoWriteBarrier(result, PromiseReactionJobInfo::kTasksOffset,
                                  tasks);
   StoreObjectFieldNoWriteBarrier(
       result, PromiseReactionJobInfo::kDeferredPromiseOffset, deferred_promise);
   StoreObjectFieldNoWriteBarrier(
       result, PromiseReactionJobInfo::kDeferredOnResolveOffset,
       deferred_on_resolve);
   StoreObjectFieldNoWriteBarrier(
       result, PromiseReactionJobInfo::kDeferredOnRejectOffset,
       deferred_on_reject);
-  StoreObjectFieldRoot(result, PromiseReactionJobInfo::kDebugIdOffset,
-                       Heap::kUndefinedValueRootIndex);
-  StoreObjectFieldRoot(result, PromiseReactionJobInfo::kDebugNameOffset,
-                       Heap::kUndefinedValueRootIndex);
+  StoreObjectFieldNoWriteBarrier(result, PromiseReactionJobInfo::kDebugIdOffset,
+                                 SmiConstant(kDebugPromiseNoID));
+  StoreObjectFieldNoWriteBarrier(result,
+                                 PromiseReactionJobInfo::kDebugNameOffset,
+                                 SmiConstant(kDebugNotActive));
   StoreObjectFieldNoWriteBarrier(result, PromiseReactionJobInfo::kContextOffset,
                                  context);
   return result;
 }
 
 }  // namespace internal
 }  // namespace v8