Fix windows test runner.

TBR=titzer@chromium.org

Review URL: https://codereview.chromium.org/494603002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23221 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Check in "cpu.sh" script to control CPU governor/cores on Linux

This can help with reproducing stability bugs or performance issues.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/485763003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23222 ce2b1a6d-e550-0410-aec6-3dcde31c8c00