Version 3.31.0 (based on 50a829b3cfe8ec0b7ccd1b7e154e632c9a73e5f0)

Classes: Partial fix for constructor not calling super (issues 3661, 3672).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@25239 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/trunk' into trunk