[es6] fixup for rest parameters perf test

test/js-perf-test/RestParameters/rest.js

 // Copyright 2015 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.
 
-new BenchmarkSuite('Basic', [1000], [
+new BenchmarkSuite('Basic1', [1000], [
   new Benchmark('BasicRest1', false, false, 0,
                 BasicRest1, BasicRest1Setup, BasicRest1TearDown)
 ]);
 
 // ----------------------------------------------------------------------------
 
 var result;
 
 function basic_rest_fn_1(factor, ...values) {
   var result = 0;
   for (var i = 0; i < values.length; ++i) {
     result += (factor * values[i]);
   }
   return result;
 }
 
 function BasicRest1Setup() {}
 
 function BasicRest1() {
   result = basic_rest_fn_1(10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
 }
 
 function BasicRest1TearDown() {
   return result == 550;
 }