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Summary

  1. Revert [git-llvm] Do not reinvent `@{upstream}` (details)
Commit daa79c5338228a746a7eba0cf2f2f356e1d45a5b by Mehdi Amini
Revert [git-llvm] Do not reinvent `@{upstream}`
This reverts r371290 (git commit
7faffd544b16f851a632d6b8f93e3c8485ff34bb)
The change wasnt NFC and broke some users' workflow. Reverting while
figuring out the best alternative to move forward.
llvm-svn: 371480
The file was modifiedllvm/utils/git-svn/git-llvm