HStoreKeyed for Smis optimized for x64 + related redundant moves of elements removed

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/108503004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18362 ce2b1a6d-e550-0410-aec6-3dcde31c8c00