[V8] Unify get function name for debugging purpose

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 89ebdd7675d15231a601e285b7bfaed19e52013b..4b0162f65f40396a4a6f591d6b7658049478f2c0 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -11923,7 +11923,7 @@ bool JSFunction::PassesFilter(const char* raw_filter) {
 }
 
 
-Handle<String> JSFunction::GetDebugName(Handle<JSFunction> function) {
+Handle<String> JSFunction::GetName(Handle<JSFunction> function) {
   Isolate* isolate = function->GetIsolate();
   Handle<Object> name =
       JSReceiver::GetDataProperty(function, isolate->factory()->name_string());
@@ -11932,6 +11932,15 @@ Handle<String> JSFunction::GetDebugName(Handle<JSFunction> function) {
 }
 
 
+Handle<String> JSFunction::GetDebugName(Handle<JSFunction> function) {
+  Isolate* isolate = function->GetIsolate();
+  Handle<Object> name = JSReceiver::GetDataProperty(
+      function, isolate->factory()->display_name_string());
+  if (name->IsString()) return Handle<String>::cast(name);
+  return JSFunction::GetName(function);
+}
+
+
 void Oddball::Initialize(Isolate* isolate, Handle<Oddball> oddball,
                          const char* to_string, Handle<Object> to_number,
                          const char* type_of, byte kind) {