Summary:
After D4825, this information is often available to us in a safe way. Provide it explictly.
This removes or reduces functionality in some cases, but I think we can plug those holes with Conpherence addresses and/or explicit user acknowledgement/config.
Test Plan: Patched a commit with `arc patch` and got the original address out.
Reviewers: btrahan, edward, vrana
Reviewed By: btrahan
CC: aran
Differential Revision: https://secure.phabricator.com/D4828
epriestley
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