Before comparing input with a constant smi in GenerateRecordCallTarget(), make sure the input register is actually a smi.

BUG=

Review URL: https://codereview.chromium.org/14803005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14547 ce2b1a6d-e550-0410-aec6-3dcde31c8c00