[llvm] [dsymutil] Add option to copy swiftmodules built from interface (PR #165293)

[Adrian Prantl via llvm-commits]

adrian-prantl wrote:

> Do you happen to have an ETA of when the transition will finish? This will help us decide if we still want to merge and cherry-pick the current patch for now (and later transit to your solution).

The work is happening on `main` right now, so unless there are unknown surprises, it would be part of the next release that branches from `main`.

https://github.com/llvm/llvm-project/pull/165293