Port r20458 (984d99c9)

Oirginal commit message:
This is to avoid triggering an assertion from Smi::FromInt. The
generated code is unreachable, so it is not a real bug.

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/224583002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20491 ce2b1a6d-e550-0410-aec6-3dcde31c8c00