Improved GC performance when moving parts of a FixedArray (issue 2452).

Enabled readline on d8 while building a shared lib (issue 1781).

Fixed missing exception check in typed array constructor (Chromium issue 168545).

Check for read-only-ness when preparing for array sort (issue 2419).

Performance and stability improvements on all platforms.

git-svn-id: http://v8.googlecode.com/svn/trunk@13346 ce2b1a6d-e550-0410-aec6-3dcde31c8c00