[clang] [clang] Implement P2582R1: CTAD from inherited constructors (PR #98788)

[via cfe-commits]

cor3ntin wrote:

@antangelo @hokein What's the status here?
If this is not merged by next week it won't make clang 20 (and there are unaddressed comments)

Thanks!

https://github.com/llvm/llvm-project/pull/98788