In the case where we generate a generic load or store, we don't need to emit a non-smi-check and a map-check before it.
Review URL: http://codereview.chromium.org/9252008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10430 ce2b1a6d-e550-0410-aec6-3dcde31c8c00