Version 3.30.6 (based on bleeding_edge revision r24474)

Update unicode to 7.0.0 (issue 2892).

Classes: Add support for toString (issue 3330).

Don't enable WPO on Win64 and require Server 2003 / x64 for win64 (Chromium issue 421363).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@24476 ce2b1a6d-e550-0410-aec6-3dcde31c8c00