The `find` function will require a request or command to convert an argument to a commit object. While that is reasonable in most circumstances, many tools will pass a hash to the files_changed function, which does not need to be converted to a Commit object to be used. Bypass the `find` call if the caller of `files_changed` passed an argument which is obviously a hash.
<rdar://problem/105106632>
Pull request: https://github.com/WebKit/WebKit/pull/9726
Committed 259959@main (06835af6148a): <https://commits.webkit.org/259959@main> Reviewed commits have been landed. Closing PR #9726 and removing active labels.
Committed 259548.64@safari-7615-branch (073b621aaa39): <https://commits.webkit.org/259548.64@safari-7615-branch> Reviewed commits have been landed. Closing PR #364 and removing active labels.