[clang] [PATCH 1/4] [clang] Improve nested name specifier AST representation (PR #147835)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

> For obvious reasons, I wasn't able to make even a reasonably thorough review here, but I came across a few things that seemed like good ideas. All 4 of the patches are STILL huge.
> 
> IMO, unless this can be more bite-sized changes, I don't know how to proceed here.

Yes this can be more bite-sized changes, as long as we keep the patches not individually testable.

I will follow the suggestion above.

https://github.com/llvm/llvm-project/pull/147835