[clang] [clang] Defer handling of function type attributes in type aliases (PR #167426)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

This doesn't really FEEL correct here, but I don't know enough about this section of how Declarators + attributes are handled, so @AaronBallman is going to have to review this.

https://github.com/llvm/llvm-project/pull/167426