[tor-bugs] #23953 [Core Tor/Tor]: Use stdatomic counters where available

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#23953: Use stdatomic counters where available
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     Reporter:  nickm         |      Owner:  nickm
         Type:  enhancement   |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.3.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 C11 has built-in atomics; we may as well use them to implement
 atomic_counter_t and speed up a little.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23953>
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