<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/139856>139856</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [ARM64EC] Can't `std::invoke` a virtual function
        </td>
    </tr>

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

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

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

<pre>
    Minimal code to reproduct:
````c++
struct ChildClass {
  virtual int fn() { return m_c0;  }

  int m_c0{0xcd};
};


int main()
{
  auto obj = new ChildClass();
  auto v = std::invoke(&ChildClass::fn, obj);
  return v;
}
````

The crash point always like this:

> [0x0] ConsoleApplication1!ChildClass::`vcall'{0}'+0x54   0x66f818fc00 0x7ff78acc1184 


Verison: clang 20.1.4
target: arm64ec-pc-windows-msvc

This is a arm64ec specific problem. This can't be reproduced on arm64-pc-windows-msvc
For a simple virtual function call, there is no problem.

This bug also makes googletest unusable.
</pre>
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