[errors] Improve NotGeneric error message

src/builtins/builtins-function.cc

 // Copyright 2016 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/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/code-factory.h"
 #include "src/compiler.h"
 #include "src/conversions.h"
 #include "src/counters.h"
@@ skipping 294 matching lines @@
   HandleScope scope(isolate);
   Handle<Object> receiver = args.receiver();
   if (receiver->IsJSBoundFunction()) {
     return *JSBoundFunction::ToString(Handle<JSBoundFunction>::cast(receiver));
   } else if (receiver->IsJSFunction()) {
     return *JSFunction::ToString(Handle<JSFunction>::cast(receiver));
   }
   THROW_NEW_ERROR_RETURN_FAILURE(
       isolate, NewTypeError(MessageTemplate::kNotGeneric,
                             isolate->factory()->NewStringFromAsciiChecked(
-                                "Function.prototype.toString")));
+                                "Function.prototype.toString"),
+                            isolate->factory()->Function_string()));
 }
 
 }  // namespace internal
 }  // namespace v8