Version 3.30.15 (based on bleeding_edge revision r24751)

Avoid the Marsaglia effect in 3D (Chromium issue 423311).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@24772 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/trunk' into trunk