Pass \n, \r and \t through OStream without escaping.

BUG=
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/458533002

Patch from Vyacheslav Egorov <vegorov@google.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23478 ce2b1a6d-e550-0410-aec6-3dcde31c8c00