Version 3.28.71.5 (merged r23129, r23114)

Rewrite GetAccessor using the LookupIterator

Fix pointer iteration for maps.

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/471433006

git-svn-id: https://v8.googlecode.com/svn/branches/3.28@23373 ce2b1a6d-e550-0410-aec6-3dcde31c8c00