In crankshafted code, we were creating allocation mementos for shallow
SMI array literals when we shouldn't. The idea is that we should have learned
by this point what type of array we'll end up with.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/25146007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17028 ce2b1a6d-e550-0410-aec6-3dcde31c8c00