<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/75520>75520</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            UB in XCOFF after #72532
        </td>
    </tr>

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

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

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

<pre>
    @stephenpeckham There is UB shifting negative value https://lab.llvm.org/buildbot/#/builders/85/builds/20910

I recovered bots with 36477f7562c0f951bcfe3df5ae7a566e6e462dd1, but I don't know if negatives are expected there.

So please double check.
</pre>
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