It leads to compability hell, and the amount of memory we need is bounded,
anyway. Added a few more assertions on the way.

Review URL: https://chromiumcodereview.appspot.com/10808029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12137 ce2b1a6d-e550-0410-aec6-3dcde31c8c00