[clang] [clang-tools-extra] [Clang] Add a builtin that deduplicate types into a pack (PR #106730)

[Ilya Biryukov via cfe-commits]

ilya-biryukov wrote:

> @ilya-biryukov I've addressed these warnings with #154606.

Thanks a lot! And sorry for not spotting this earlier, I do not have LLDB build configured locally. It would be great to add this to presubmits at some point in order to spot those problems.

https://github.com/llvm/llvm-project/pull/106730