Deprecate several unchecked accessors.

R=hpayer@google.com
BUG=v8:1490

Review URL: https://codereview.chromium.org/16663009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15123 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Implement IC support for Constant Function transitions.

R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/16826016

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15124 ce2b1a6d-e550-0410-aec6-3dcde31c8c00