immediately when putting a copy in the entry frame, rather than as
part of a separate pass after fully constructing the entry fraem.

Review URL: http://codereview.chromium.org/113198

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1907 ce2b1a6d-e550-0410-aec6-3dcde31c8c00