[V8] Use Function.name for stack frames in v8::StackTrace

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 7cd8b002c4b096e15c83a085eba72eaaf4b8739c..9c2d9e5a77c18d3c0c9939e2ee5746c9c39fb78b 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -489,6 +489,8 @@ class CaptureStackTraceHelper {
     if (options & StackTrace::kFunctionName) {
       function_key_ = factory()->InternalizeOneByteString(
           STATIC_CHAR_VECTOR("functionName"));
+      name_key_ =
+          factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("name"));
     }
     if (options & StackTrace::kIsEval) {
       eval_key_ =
@@ -550,7 +552,9 @@ class CaptureStackTraceHelper {
     }
 
     if (!function_key_.is_null()) {
-      Handle<Object> fun_name(fun->shared()->DebugName(), isolate_);
+      Handle<Object> fun_name = JSObject::GetDataProperty(fun, name_key_);
+      if (!fun_name->IsString())
+        fun_name = Handle<Object>(fun->shared()->DebugName(), isolate_);
       JSObject::AddProperty(stack_frame, function_key_, fun_name, NONE);
     }
 
@@ -581,6 +585,7 @@ class CaptureStackTraceHelper {
   Handle<String> function_key_;
   Handle<String> eval_key_;
   Handle<String> constructor_key_;
+  Handle<String> name_key_;
 };