Replace OStream with std::ostream.

Review URL: https://codereview.chromium.org/618643002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24319 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Get rid of code duplication by computing int Lub using range Lub.

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/616563002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24320 ce2b1a6d-e550-0410-aec6-3dcde31c8c00