Use displayName in Error.stack rendering if present.

src/api.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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 4443 matching lines @@
 
 Local<Value> Function::GetDisplayName() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ENTER_V8(isolate);
   auto self = Utils::OpenHandle(this);
   if (!self->IsJSFunction()) {
     return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
   }
   auto func = i::Handle<i::JSFunction>::cast(self);
   i::Handle<i::String> property_name =
-      isolate->factory()->NewStringFromStaticChars("displayName");
+      isolate->factory()->display_name_string();
   i::Handle<i::Object> value =
       i::JSReceiver::GetDataProperty(func, property_name);
   if (value->IsString()) {
     i::Handle<i::String> name = i::Handle<i::String>::cast(value);
     if (name->length() > 0) return Utils::ToLocal(name);
   }
   return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
 }
 
 
@@ skipping 4087 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8