````
var array = new Uint8Array(65000);
var startDate = Date.now();
var counter = 0;
while (counter++ < 50000000) {
  array.subarray(start, end);
}
var endDate = Date.now();
print(endDate - startDate);
````

4200 ms -> 3500 ms (16.67%)

BUG=

Review URL: https://codereview.chromium.org/1331993004

Cr-Commit-Position: refs/heads/master@{#30770}