- was missing an import sys
- check for long
- check for xrange

This file is now flake8 warning free, and should work on both Py2 and
Py3.

$ flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics

Bug: v8:8594
Change-Id: Iae857f4686bcad509fa700954b7f30f86150739f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2288177Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68809}