<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64574>64574</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            10 times slower compilation of a specific source file when targetting s390x linux after d6f994acb3d545b80161e24ab742c9c69d4bbf33
        </td>
    </tr>

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

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

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

<pre>
    Before d6f994acb3d545b80161e24ab742c9c69d4bbf33, the file would compile in 2 minutes when targeting s390x linux, but after, it takes over 20 minutes!

STR:
- Download https://gist.githubusercontent.com/glandium/877b776637c1f4360ac0768cbb8b9be6/raw/117712629b6a74e67b3cc3676d83ba25e1d9cc9a/gl.ii
- compile with `clang++ --target=s390x-unknown-linux-gnu -O2 -std=c++17 -o gl.o -c gl.ii`

That command line actually "only" takes 8 minutes on my machine, but adding `-fstack-clash-protection` makes it go over the 20 minutes mark.

Cc: @kazutakahirata 
</pre>
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