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

[Alexandre Ganea via llvm-commits]

https://github.com/aganea approved this pull request.

LGTM.

Are able to step-debug a binary generated with your PR? Before we merge this I'd like to be sure we're not breaking the user experience when debugging with the Visual Studio debugger.

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