Don't record slots of objects that may contain raw values.

BUG=
R=mstarzinger@chromium.org, yangguo@chromium.org

Review URL: https://codereview.chromium.org/555783002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23791 ce2b1a6d-e550-0410-aec6-3dcde31c8c00