[clang] [llvm] Add support for Arm Cortex A78AE CPU (PR #84485)

[David Spickett via llvm-commits]

DavidSpickett wrote:

Also does this address the -mcpu=native part of https://github.com/llvm/llvm-project/issues/84450 as well?

https://github.com/llvm/llvm-project/pull/84485