For now the smi part only handles power of two right hand side operands.

Fixed a bug when loading floating point value into core registers with VFP supported.
Review URL: http://codereview.chromium.org/6312059

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6560 ce2b1a6d-e550-0410-aec6-3dcde31c8c00