Too many updates to summarize them here.

This version of ICU allows for using a .dat file on posix systems that is mmaped
instead of compiling the data in like we currently do.

BUG=72633
LOG=n
R=jshin@chromium.org, machenbach@chromium.org

Review URL: https://codereview.chromium.org/109963003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18336 ce2b1a6d-e550-0410-aec6-3dcde31c8c00