[tor-bugs] #22448 [Core Tor/Tor]: Move circuit_t.timestamp_dirty into origin_circuit_t

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#22448: Move circuit_t.timestamp_dirty into origin_circuit_t
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     Reporter:  nickm     |      Owner:
         Type:  defect    |     Status:  new
     Priority:  Medium    |  Milestone:  Tor: unspecified
    Component:  Core      |    Version:
  Tor/Tor                 |
     Severity:  Normal    |   Keywords:  tor-client tor-relay refactor easy
Actual Points:            |  Parent ID:
       Points:  2         |   Reviewer:
      Sponsor:            |
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 It's not meaningful for an or_circuit_t to be dirty; we shouldn't expire
 them in the same way.

 Of course, we shouldn't do this recklessly: instead, when we make this
 change, we should make sure that it's actually safe.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22448>
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