Revert "[test] Add JSTest benchmark for object literal spread"

This reverts commit 0258a061.

Reason for revert: breaks perfbots, e.g. https://luci-milo.appspot.com/buildbot/internal.client.v8/v8_arm64_perf/21485

Original change's description:
> [test] Add JSTest benchmark for object literal spread
> 
> Bug: v8:7611
> Change-Id: Ia5467fd4da3b385568bcc3f3fdc1a8c56bd6340e
> Reviewed-on: https://chromium-review.googlesource.com/987321
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#52313}

TBR=gsathya@chromium.org,bmeurer@chromium.org

Change-Id: I4a0e8da965b784739f821ff2c3bba742e70a4b7f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7611
Reviewed-on: https://chromium-review.googlesource.com/992092Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52319}

test/js-perf-test/JSTests.json

@@ -351,21 +351,6 @@
         {"name": "ValuesMegamorphic"}
       ]
     },
-    {
-      "name": "ObjectLiteralSpread",
-      "path": ["ObjectLiteralSpread"],
-      "main": "run.js",
-      "resources": [],
-      "results_regexp": "^%s\\-ObjectLiteralSpread\\(Score\\): (.+)$",
-      "tests": [
-        {"name": "Babel"},
-        {"name": "BabelAndOverwrite"},
-        {"name": "ObjectAssign"},
-        {"name": "ObjectAssignAndOverwrite"},
-        {"name": "ObjectSpread"},
-        {"name": "ObjectSpreadAndOverwrite"}
-      ]
-    },
     {
       "name": "Scope",
       "path": ["Scope"],

test/js-perf-test/ObjectLiteralSpread/run.js

-// Copyright 2018 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.
-
-const input = {
-  a: 1,
-  b: 2,
-  c: 3,
-  ['d']: 4,
-  1: 5
-};
-
-
-// ----------------------------------------------------------------------------
-// Benchmark: Babel
-// ----------------------------------------------------------------------------
-
-function _extends(target) {
-  for (var i = 1; i < arguments.length; i++) {
-    var source = arguments[i];
-    for (var key in source) {
-      if (Object.prototype.hasOwnProperty.call(source, key)) {
-        target[key] = source[key];
-      }
-    }
-  }
-  return target;
-};
-
-function Babel() {
-  const result = _extends({}, input);
-  if (Object.keys(result).length != 5) throw 666;
-}
-
-function BabelAndOverwrite() {
-  const result = _extends({}, input, {a: 6});
-  if (Object.keys(result).length != 5) throw 666;
-}
-
-// ----------------------------------------------------------------------------
-// Benchmark: Object.assign
-// ----------------------------------------------------------------------------
-
-
-function ObjectAssign() {
-  const result = Object.assign({}, input);
-  if (Object.keys(result).length != 5) throw 666;
-}
-
-function ObjectAssignAndOverwrite() {
-  const result = Object.assign({}, input, {a : 6});
-  if (Object.keys(result).length != 5) throw 666;
-}
-
-
-// ----------------------------------------------------------------------------
-// Benchmark: Object.assign
-// ----------------------------------------------------------------------------
-
-
-function ObjectSpread() {
-  const result = { ...input };
-  if (Object.keys(result).length != 5) throw 666;
-}
-
-function ObjectSpreadAndOverwrite() {
-  const result = { ...input, a: 6 };
-  if (Object.keys(result).length != 5) throw 666;
-}
-
-// ----------------------------------------------------------------------------
-// Setup and Run
-// ----------------------------------------------------------------------------
-
-load('../base.js');
-
-var success = true;
-
-function PrintResult(name, result) {
-  print(name + '-ObjectLiteralSpread(Score): ' + result);
-}
-
-function PrintError(name, error) {
-  PrintResult(name, error);
-  success = false;
-}
-
-function CreateBenchmark(name, f) {
-  new BenchmarkSuite(name, [100], [ new Benchmark(name, false, false, 0, f) ]);
-}
-
-CreateBenchmark('Babel', Babel);
-CreateBenchmark('BabelAndOverwrite', BabelAndOverwrite);
-CreateBenchmark('ObjectAssign', ObjectAssign);
-CreateBenchmark('ObjectAssignAndOverwrite', ObjectAssignAndOverwrite);
-CreateBenchmark('ObjectSpread', ObjectSpread);
-CreateBenchmark('ObjectSpreadLiteral', ObjectSpreadLiteral);
-
-BenchmarkSuite.config.doWarmup = undefined;
-BenchmarkSuite.config.doDeterministic = undefined;
-BenchmarkSuite.RunSuites({NotifyResult: PrintResult, NotifyError: PrintError});