Fixed handling of arrays in DefineOwnProperty. (issue 1756)

Sync parser and preparser on do-while and return statements. (issue 1856)

Fixed another corner case for DefineOwnProperty on arrays (issue 1756).

Stability and performance improvements on all platforms.


git-svn-id: http://v8.googlecode.com/svn/trunk@10239 ce2b1a6d-e550-0410-aec6-3dcde31c8c00