[clang] Add fallback type for Constrained placeholders other than plain auto. (PR #209893)

[Chibuoyim Ogbonna via cfe-commits]

bruteforceboy wrote:

@erichkeane very minor nit here: the bullet under "Bug fixes to C++ support" is not spaced and doesn't render properly.

https://github.com/llvm/llvm-project/pull/209893