Don't reflect ES2015 Function name inference in Function.prototype.toString

src/ast/ast.cc

Index: src/ast/ast.cc
diff --git a/src/ast/ast.cc b/src/ast/ast.cc
index 6eddb55c2428e56ac20e461f5ce9d73b40523a23..9b2c6388c1626c4bbe975dde7a01794acfc716e4 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -275,6 +275,12 @@ ObjectLiteralProperty::ObjectLiteralProperty(AstValueFactory* ast_value_factory,
   }
 }
 
+bool ObjectLiteralProperty::NeedsSetFunctionName() const {
+  return is_computed_name_ &&
+         (value_->IsAnonymousFunctionDefinition() ||
+          (value_->IsFunctionLiteral() &&
+           IsConciseMethod(value_->AsFunctionLiteral()->kind())));
+}
 
 void ClassLiteral::AssignFeedbackVectorSlots(Isolate* isolate,
                                              FeedbackVectorSpec* spec,