Some new AllocationSite fields weren't accessed with the correct
representation.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/101783005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18253 ce2b1a6d-e550-0410-aec6-3dcde31c8c00