[llvm-bugs] [Bug 139856] [ARM64EC] Can't `std::invoke` a virtual function

[LLVM Bugs via llvm-bugs]

Issue	139856
Summary	[ARM64EC] Can't `std::invoke` a virtual function
Labels	new issue
Assignees
Reporter	tuxzz

    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 

![Image](https://github.com/user-attachments/assets/c515e077-1d87-4ecb-99f4-fbf6c331429b)

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.

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