<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/126360>126360</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Pull compact-unwind support into llvm-20 (2nd attempt)
        </td>
    </tr>

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

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

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

<pre>
    We should pull ORC compact-unwind support into LLVM 20. This is needed to support JIT'd exceptions and stack unwinding on M1 Macs.

These patches only touch ORC / JITLink (and associated test tools), and only change behavior for JIT'd code on Darwin.

/cherry-pick 7fb233f549dee0346332562de050ef2ab3654329 a1ff2d18466bc27d3dc9b8bba688454e2a1cf196 b46211bbf683b30b88e41a684633fc63436e5edf c0f7ebe715dbe706224389a3022e6a3880fef0a1 b84ac58dce65ea94994c24f40a14208c47f8119f 52b5e3638a39e977bebb491312a6f7c53314efec 9de581b206eceac331aa26e13b62a9a35bfd406f eae6d6d18bd4d9e7dfe5fc1206d23d8ef663c8c7 aefa30e2301f155d4f4737d6f6c55c66eac58b2d 88f55d16c4c247a9eef326961a1445dee3f2e30c 4a2a8ed70da7ec44f0aa9092595e5b0f81a7e841 9d88ffe7f7b4a46d3bcb7bbdf0d7eb037ab5ba04 7a213e70eb24e621042f2fda043622048cb1f1df e00f824e9a5ea73830bd346115968fa9ace84cbf 7811c20bcd9d5b117a9543d74c71448fe9970fe6 63bb4ba84a22279c1cdd4953f0c19269b23a9d32 e2eaf8ded78507100513a17e8193e2c4b094f8da 
</pre>
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