[clang] [llvm] [llvm][AArch64] Move Apple aliases into the CpuAlias map (PR #96249)

[Jon Roelofs via llvm-commits]

jroelofs wrote:

> Can all the cpu aliases work in the same way? Or do you want them to work different, where they are not just frontend aliases?

I hadn't noticed that mechanism. There were some holes that needed to be addressed, but after fixing them, this does look like a better way to handle them.

https://github.com/llvm/llvm-project/pull/96249