<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/162373>162373</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang][Modules] PCM Sizes Increased Significantly After Delta Encoding Optimization Removed
        </td>
    </tr>

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

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

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

<pre>
    Hi @hokein @ChuanqiXu9 ! 

I work with @Bigcheese and @cyndyishida on Clang Modules. We noticed that the PCM sizes have increased significantly (5%) after https://github.com/llvm/llvm-project/pull/145670. I can see that the 5% increase is [expected](https://github.com/llvm/llvm-project/pull/145670#issue-3175167642), but combining this with some other commits that increase PCM sizes, we are experiencing build failures where builders run out of disk space. 

Do we have a plan going forward to claw back some of the disk space increase caused by this PR? 
</pre>
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