Use 'git svn find-rev' in git-svnrevert instead of shell script fu.

2013-04-26T03:27:39Z

Thanks Chandler! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180592 91177308-0d34-0410-b5e6-96231b3b80d8

Added the scripts git-svnup/git-svnrevert to utils/git-svn.

2013-04-26T00:58:45Z

It makes more sense to have git-svnup here than catting said file in the documentation (where we should rather point users to this directory). I included git-svnrevert as an additional gift to the community. I will update the documentation in a second commit later today. git-svnrevert takes in a git hash for a commit, looks up the svn revision for said commit and then creates the normal git revert commit message with the one liner message, except instead of saying Revert "<<>>" This reverts commit <<>> It says: Revert "<<>>" This reverts commit r<<>> so git hashes will not escape into our svn logs (which just look unseemly). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180587 91177308-0d34-0410-b5e6-96231b3b80d8

llvm/utils/git-svn, branch master

Use 'git svn find-rev' in git-svnrevert instead of shell script fu.

Added the scripts git-svnup/git-svnrevert to utils/git-svn.