Port Latin-1 changes to the interpreted regexp.

R=dcarney@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/12674024

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14044 ce2b1a6d-e550-0410-aec6-3dcde31c8c00