It had only 2 uses: One use could be rewritten in a simpler way, and the other
is actually more readable after inlining and fixing the comments.

Review URL: https://chromiumcodereview.appspot.com/9233006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10462 ce2b1a6d-e550-0410-aec6-3dcde31c8c00