[llvm-dev] New git revert workflow for github repo

[Jordan Rupprecht via llvm-dev]

Hi all,
Last week I had to revert a change during my build cop shift, and
discovered the usual script I used, git-svnrevert, only works w/ git-svn
repos, and not the pure github repo, meaning I had to:
1) Find the git commit hash I needed to revert (given the svn revision that
broke it)
2) Run "git revert" myself, and then I forgot to include the svn id (the
git revert default message just includes the git commit hash, and I forgot
to change that)

It doesn't make sense to do that manually, so I committed r357180 to make a
new git subcommand do that: "git llvm revert r123456" should now work. "git
llvm revert -n r123456" will do nothing but print the commands (if you
don't trust it yet). Also, since it might be useful outside of the revert
flow, a second subcommand "git llvm svn-lookup <git-hash>" will pull the
svn id out of the git commit message.

If you're developing with the pure github repo (not the git-svn method, and
not the even older pure-svn method), please try it out next time you have
to revert. Patches welcome if you think something could be improved.

-- Jordan
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