Revert r305598, "utils: Add a git-r utility for mapping svn revisions to git revisions in the monorepo."
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: 0ff597fd157e6f4fc38580e8d64ab130330d2411@305741 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm