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

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

With template specialization resugaring, these being typedefs still help somewhat:
https://compiler-explorer.com/z/qKxbYMEGq

You have to make a bit of contortion to expose the intermediate type, but I think that's partly due to a different problem, where in diagnostics we don't try to skip over some unhelpful top level typedefs, like vector's `value_type`.

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