[clang] Clang AST updates for more details (PR #152372)

[Reid Kleckner via cfe-commits]

rnk wrote:

> This seems large enough that it might warrant an RFC with a more detailed motivation
> 
> https://clang.llvm.org/get_involved.html#:~:text=The%20Clang%20community%20uses,will%20proceed%20or%20not.
> 
> @erichkeane @rnk

I think I agree with Aaron's feedback back in August, all those points seem valid.

https://github.com/llvm/llvm-project/pull/152372