llvm_tools: mail the mage from the revert checker

I accidentally removed this in an earlier CL.

BUG=chromium:1046988
TEST=unittests

Change-Id: Iebf0c282383d1e99ddeb0cafa7ffa93f1dc27abc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2171296
Reviewed-by: Tiancong Wang <tcwang@google.com>
Tested-by: Tiancong Wang <tcwang@google.com>
1 file changed