[jstest] Add random data configuration to ArraySortPreSorted

This CL adds sorting of a randomized array to the PreSorted benchmark
to act as a baseline/reference point.

R=jgruber@chromium.org

Bug: v8:7382
Change-Id: I45b77a6584d5d9a4f14a807f3796af7197673eaa
Reviewed-on: https://chromium-review.googlesource.com/1109508Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@google.com>
Cr-Commit-Position: refs/heads/master@{#53913}

test/js-perf-test/ArraySort/sort-presorted.js

@@ -57,6 +57,12 @@ function SawSeq3(a, tooth, length) {
   }
 }
 
+function Random(a, length) {
+  for (let i = 0; i < length; ++i) {
+    a.push(Math.floor(Math.random() * length));
+  }
+}
+
 function TearDown() {
   // Sanity check that the array is sorted.
   let length = array_to_sort.length - 1;
@@ -85,6 +91,8 @@ let SetupUpUp = () => SetupPreSortedHalfs(Up, Up);
 let SetupDownDown = () => SetupPreSortedHalfs(Down, Down);
 let SetupDownUp = () => SetupPreSortedHalfs(Down, Up);
 
+createSortSuite(
+    'Random', 1000, SortAsc, () => Random(array_to_sort, kLength), TearDown);
 createSortSuite(
     'Up', 1000, SortAsc, () => Up(array_to_sort, kLength), TearDown);
 createSortSuite(

test/js-perf-test/JSTests.json

@@ -781,6 +781,7 @@
         "--allow-natives-syntax"
       ],
       "tests": [
+        {"name": "Random"},
         {"name": "Up"},
         {"name": "Down"},
         {"name": "Saw1000"},