the issue of how the pointee is found and how the pointer
is encoded are separated out.  This will make it simpler to
support various pointers from and to code in the future.
Review URL: http://codereview.chromium.org/2069013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4687 ce2b1a6d-e550-0410-aec6-3dcde31c8c00