<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/153663>153663</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang][PAC][ObjC] Include pointer auth protections for block metadata
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

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

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

<pre>
    We need to include the pointer auth changes for the block ABI in llvm21, to go with all the other ABI flags.

This is blocked by #153662

/cherry-pick d8850ee
</pre>
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