[es6] fixup for rest parameters perf test

BUG=v8:2160
LOG=N
NOTRY=true
R=adamk, machenbach@chromium.org, rossberg

Review URL: https://codereview.chromium.org/1331803003

Cr-Commit-Position: refs/heads/master@{#30682}

test/js-perf-test/JSTests.json

@@ -18,7 +18,7 @@
       "units": "score",
       "results_regexp": "^%s\\-RestParameters\\(Score\\): (.+)$",
       "tests": [
-        {"name": "BasicRest1"}
+        {"name": "Basic1"}
       ]
     },
     {

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

@@ -2,7 +2,7 @@
 // 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)
 ]);