[lldb] [llvm] [LLVM] [LLDB] Emit and handle `lf_alias` nodes (PR #152484)

[Jonas Devlieghere via llvm-commits]

JDevlieghere wrote:

+1 on Dave's suggestion to break this up into two PRs, one for LLVM (with dedicated tests) and one for LLDB (with a test that can rely on llvm to generate the aliases).

https://github.com/llvm/llvm-project/pull/152484