<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/79220>79220</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc] deduplicate call_once
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            enhancement,
            libc
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          nickdesaulniers
      </td>
    </tr>
</table>

<pre>
    We seem to have both
- libc/src/threads/linux/call_once.cpp
- libc/src/__support/threads/linux/callonce.cpp

Seems like duplicated code, perhaps?
</pre>
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