<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/57978>57978</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Backport request for GN build fix
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            release:backport
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          peterwaller-arm
      </td>
    </tr>
</table>

<pre>
    I find the gn build useful for development and it became broken on the release/15.x branch. This cherry pick is a quick fix. Since it only touches a single gn file in a trivial way I believe it's obviously safe for backporting.

/cherry-pick dd428a571c69621d5b6eb2e0e3ce5497c304fb2c

/cc @nico in case there is a good reason to not do this. Thanks.
</pre>
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