[clang] [llvm] [clang] Polymorphic Cleanup type is moved despite not being POD types (PR #156607)

[Oliver Hunt via llvm-commits]

ojhunt wrote:

> Not really sure I get the motivation/what is happening here, but I don't know if there is a better person to review? Perhaps @efriedma-quic can give it a quick double-check as well?

If you build clang targeting arm64e, pointer authentication means vtable pointers are not memcopyable by default.

The fix itself is trivial, I'm more concerned about people being ok with the location of the macro

https://github.com/llvm/llvm-project/pull/156607