Version 3.23.0

Fixed loading message from an Error object.  (Chromium issue 306220)

Made Object.freeze/seal/preventExtensions observable. (issue 2975, 2941)

Made snapshots reproducible. (issue 2885)

Added missing negative dictionary lookup to NonexistentHandlerFrontend. (issue 2980)

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@17517 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/trunk' into trunk