I noticed this convention from the commit logs. It seems like it
would be useful to document it, to encourage other committers to link
back to code reviews in their commits.
Differential Revision: http://llvm-reviews.chandlerc.com/D2678
llvm-svn: 201160
offer up my email to the spam lords for it. Hopefully this will
eventually be more automatic, but we don't want people to think there is
only one option.
llvm-svn: 166870