[clang] [clang] Implement CTAD for type alias template. (PR #77890)

[via cfe-commits]

cor3ntin wrote:

Can you mark the status of the paper in cxx_status.html as partial (with a `<details></details>` tag explaining what is missing)?
Can you update the commit message / changelog to refer to the paper number?

Thanks

https://github.com/llvm/llvm-project/pull/77890