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

[David Blaikie via cfe-commits]

dwblaikie wrote:

Per ( https://llvm.org/docs/GitHub.html#updating-pull-requests ) please don't force push, makes it hard to follow the changes to the review as they progress.

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