[llvm] [MachO] Preserve weak linkage for aliases (PR #198148)

[Folkert de Vries via llvm-commits]

folkertdev wrote:

> Mach-O features like this definitely need to get Apple's blessing.

What route should be taken to get that blessing? Opening an issue is clearly not sufficient, they stay open for years, opening a PR doesn't seem to be enough either. Are there specific labels that help, or specific people that should be tagged?

https://github.com/llvm/llvm-project/pull/198148