Merged r16795 into 3.21 branch.

Use %_Arguments instead of arguments in snapshotable i18n code

R=jochen@chromium.org, machenbach@chromium.org

Review URL: https://codereview.chromium.org/75213004

git-svn-id: https://v8.googlecode.com/svn/branches/3.21@17844 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/3.21' into 3.21