when the input is known unbox number value, eliminate the dynamic check

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/58923004

Patch from Weiliang Lin <weiliang.lin@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17834 ce2b1a6d-e550-0410-aec6-3dcde31c8c00