Revert "[test] add perf tests for String.p.startsWith"

This reverts commit 5dee355f.

Reason for revert: https://ci.chromium.org/p/v8-internal/builders/luci.v8-internal.ci/v8_linux64_perf_1/4282

Original change's description:
> [test] add perf tests for String.p.startsWith
> 
> Add performance tests for String.prototype.startsWith ahead of port to
> torque in order to keep track of how performance is affected.
> 
> Bug: v8:8400
> Change-Id: Ifc753a6f13da20c1760e545a99fd693717e3acc6
> Reviewed-on: https://chromium-review.googlesource.com/c/1402934
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58685}

TBR=jgruber@chromium.org,usharma1998@gmail.com

Change-Id: I5855b08fa5e55ab8594185a0a84a26f567e2b9d3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8400
Reviewed-on: https://chromium-review.googlesource.com/c/1404446Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58697}

test/js-perf-test/JSTests.json

@@ -528,20 +528,6 @@
             {"name": "endsIndex"}
           ]
         },
-        {
-          "name": "StringStartsWith",
-          "main": "run.js",
-          "resources": [ "string-startswith.js" ],
-          "test_flags": [ "string-startswith" ],
-          "results_regexp": "^%s\\-Strings\\(Score\\): (.+)$",
-          "run_count": 1,
-          "tests": [
-            {"name": "DirectStringsDirectSearch"},
-            {"name": "ConsStringsDirectSearch"},
-            {"name": "DirectStringsConsSearch"},
-            {"name": "ConsStringsConsSearch"}
-          ]
-        },
         {
           "name": "StringSubstring",
           "main": "run.js",

test/js-perf-test/Strings/string-startswith.js

-// Copyright 2017 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.
-
-function createSuite(name, count, fn) {
-  new BenchmarkSuite(name, [count], [new Benchmark(name, true, false, 0, fn)]);
-}
-
-const inputs = [
-  'I\xF1t\xEBrn\xE2ti\xF4n\xE0liz\xE6ti\xF8n\u2603\uD83D\uDCA9\uFFFD',
-  'Lorem ipsum dolor sit amet, consectetur adipiscing elit.',
-  'Integer eu augue suscipit, accumsan ipsum nec, sagittis sem.',
-  'In vitae pellentesque dolor. Curabitur leo nunc, luctus vitae',
-  'risus eget, fermentum hendrerit justo.',
-  'hello'.repeat(1024),
-  'h',
-  ''
-];
-const firsts = ['I', 'Integer', 'Lorem', 'risus', 'hello'];
-
-function simpleHelper() {
-  let sum = 0;
-  for (input of inputs) {
-    for (first of firsts) {
-      sum += input.startsWith(first);
-    }
-  }
-  return sum;
-}
-
-function consInputHelper() {
-  let sum = 0;
-  for (inputOne of inputs) {
-    for (inputTwo of inputs) {
-      for (first of firsts) {
-        sum += %ConstructConsString(inputOne, inputTwo).startsWith(first);
-      }
-    }
-  }
-  return sum;
-}
-
-function consFirstHelper() {
-  let sum = 0;
-  for (input of inputs) {
-    for (firstOne of firsts) {
-      for (firstTwo of firsts) {
-        sum += input.startsWith(%ConstructConsString(firstOne, firstTwo));
-      }
-    }
-  }
-  return sum;
-}
-
-function doubleConsHelper() {
-  let sum = 0;
-  for (inputOne of inputs) {
-    for (inputTwo of inputs) {
-      for (firstOne of firsts) {
-        for (firstTwo of firsts) {
-          sum += %ConstructConsString(inputOne, inputTwo).startsWith(
-            %ConstructConsString(firstOne, firstTwo)
-          );
-        }
-      }
-    }
-  }
-}
-
-createSuite('DirectStringsDirectSearch', 1000, simpleHelper);
-createSuite('ConsStringsDirectSearch', 1000, consInputHelper);
-createSuite('DirectStringsConsSearch', 1000, consFirstHelper);
-createSuite('ConsStringsConsSearch', 1000, doubleConsHelper);