Merged r20375 into 3.24 branch.

Store i18n meta data in hidden symbols instead of js accessible properties

BUG=354967
LOG=N
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/225283019

git-svn-id: https://v8.googlecode.com/svn/branches/3.24@20566 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/3.24' into 3.24