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

[Corentin Jabot via cfe-commits]

cor3ntin 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 

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