Fixed Array.prototype.join evaluation order. (issue 2263)

Perform CPU sampling by CPU sampling thread only iff processing thread is not running. (issue 2364)

When using an Object as a set in Object.getOwnPropertyNames, null out the proto. (issue 2410)

Disabled EXTRA_CHECKS in Release build.

Heap explorer: Show representation of strings.

Removed 'type' and 'arguments' properties from Error object. (issue 2397)

Added atomics implementation for ThreadSanitizer v2. (Chromium issue 128314)

Fixed LiveEdit crashes when object/array literal is added. (issue 2368)

Performance and stability improvements on all platforms.

git-svn-id: http://v8.googlecode.com/svn/trunk@12994 ce2b1a6d-e550-0410-aec6-3dcde31c8c00