Fix bogus arguments length check in StringLocaleCompare.

R=rossberg@chromium.org
TEST=test262/15.5.4.9_3

Review URL: https://codereview.chromium.org/14972015

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14623 ce2b1a6d-e550-0410-aec6-3dcde31c8c00