[clang] [C++20] [Modules] [Itanium ABI] Generate the vtable in the module unit of dynamic classes (PR #75912)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

FYI, the commit 99873b35da7ecb905143c8a6b8deca4d4416f1a9, which lists this PR as a motivator, causes breakage building a project, which I am still looking for a reduced test case.

The commit is not NFC despite what is says, just by cursory inspection of the change.

Please avoid adding NFC tag to such commits in the future and create a pull request.

https://github.com/llvm/llvm-project/pull/75912