Add test case for replacing turbofan code for debugging.

R=jarin@chromium.org
BUG=v8:3660
LOG=N

Review URL: https://codereview.chromium.org/665833003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25002 ce2b1a6d-e550-0410-aec6-3dcde31c8c00