[clang] [Clang] Transform lambda's constraints when instantiating parameter mapping (PR #195995)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

Not sure I am completely understanding the consequences of this, but I think this makes sense?  I'd love to see @mizvekov take a look though if possible before merging.

https://github.com/llvm/llvm-project/pull/195995