[llvm] [LLVM] Create `lf_alias` nodes for `typedef` and `using` (PR #153936)

[via llvm-commits]

Walnut356 wrote:

The other option is to do the LLDB PR first, but the problem is it's effectively untestable without the LLVM change because afaik there's no way to coerce MSVC into outputting `lf_alias`. 

https://github.com/llvm/llvm-project/pull/153936