The value register in storefield(smi) is not used as a temp
BUG=
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/551803005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23969 ce2b1a6d-e550-0410-aec6-3dcde31c8c00