[clang] [clang-tools-extra] [Clang] Add builtins that deduplicate and sort types (PR #106730)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

Thanks for the ping @cor3ntin.  This is more or less on the right path.  I wish we could break this up a bit to make reviewing more efficient, but I think this is vastly better than any temporary solution.

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