Version 3.30.20 (based on bleeding_edge revision r24916)

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/candidates@{#24925}
git-svn-id: https://v8.googlecode.com/svn/trunk@24925 ce2b1a6d-e550-0410-aec6-3dcde31c8c00