Update line count after attaching commit diff

Summary: We should probably do this also in `differential.creatediff` but it's not a big deal because we later call `differential.updaterevision` which does this using `DifferentialRevisionEditor`.

Test Plan: None.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3263

src/applications/repository/worker/commitmessageparser/PhabricatorRepositoryCommitMessageParserWorker.php

@@ -217,6 +217,8 @@ abstract class PhabricatorRepositoryCommitMessageParserWorker
 
     // TODO: Attach binary files.
 
+    $revision->setLineCount($diff->getLineCount());
+
     return $diff->save();
   }