Version 3.25.22 (based on bleeding_edge revision r20129)

Increase the "local variables in a function" limit (issue 3205).

Implement ES6 symbol registry and predefined symbols.

Throw exception on invalid string length instead of OOM (Chromium issue 349329).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@20133 ce2b1a6d-e550-0410-aec6-3dcde31c8c00