Encapsulate compare nil ic_state.

BUG=
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/18602003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15639 ce2b1a6d-e550-0410-aec6-3dcde31c8c00