Revert r305598, "utils: Add a git-r utility for mapping svn revisions to git revisions in the monorepo."

$ git revert `git r 305598`

We need to decide whether we want development tools to be written in
Go first.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305741 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed