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

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

I spent less time with TreeTransform.h than I wish I did, but in general I have only nits.  I see a few more of the 'add a comment to bool arguments' in TreeTransform that I didn't copy on.

In general, I think I'm down to just nits.  IF they are dealt with, feel free to accept an approval from the others while I'm gone (until Aug 14th).

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