[V8] Unify get function name for debugging purpose

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 457affec184e22bf1d7f385ca8d4a41a8d0e66d8..18e9730029b882091e856ba09d67f6e0bce84061 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7394,7 +7394,8 @@ class JSFunction: public JSObject {
   // Used for flags such as --hydrogen-filter.
   bool PassesFilter(const char* raw_filter);
 
-  // The function's name if it is configured, otherwise shared function info
+  // The function's displayName if it is set, otherwise name if it is
+  // configured, otherwise shared function info
   // debug name.
   static Handle<String> GetDebugName(Handle<JSFunction> function);