Version 3.25.20 (based on bleeding_edge revision r20092)

Fix polymorphic keyed loads for SLOPPY_ARGUMENTS_ELEMENTS (Chromium issue 350867).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@20094 ce2b1a6d-e550-0410-aec6-3dcde31c8c00