Version 3.22.5

Disabled externalization of sliced/cons strings in old pointer space (Chromium issue 276357).

Turned on handle zapping for release builds

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@17029 ce2b1a6d-e550-0410-aec6-3dcde31c8c00