<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/107799>107799</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            How to define custom suffix in lit?
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          KuiWei004
      </td>
    </tr>
</table>

<pre>
    In lit.cfg, I want to add some custom sufffix like below:
`config.suffixes = ['.ut.cc']`, but unfortunately， it doesn't work.
</pre>
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