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phabricator: update the hashes in commit messages as they get submitted

Authored by mharbison72.

Description

phabricator: update the hashes in commit messages as they get submitted

Due to the sequence of actions (posting, amending the local commit, and then
updating the Differential properties), the message in the commit is updated on
the initial send but the message displayed in Phabricator is not. It should get
updated there if the review is reposted. The data in the Commits tab is
accurate for the first phabsend.

Differential Revision: https://phab.mercurial-scm.org/D8950