[clang] [Clang] Make the result type of sizeof/pointer subtraction/size_t lit… (PR #136542)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

You can still do that with a "builtin-type as sugar" approach, you just have to make it a non-canonical node (ie `isSugared()` returns true).

It's one of the options, and whether we print an aka or not is still a diagnostic policy (we should do it only if it's relevant, but our implementation is currently very simple).

https://github.com/llvm/llvm-project/pull/136542