<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/138571>138571</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [runtimes?][PAC] harden unwinding
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    This requires changes to:

* compilerrt
* libc++abi
* libunwind
* _Maybe_ libc++ (need to verify)

This is blocked on #136828 #138570 #136828 
</pre>
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