[compiler-rt] [llvm] [LLVM][compiler-rt][AArch64] Refactor AArch64 CPU features (PR #97777)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

I'll land this. I'll see if I have some time later to take a look at the CMake solution mentioned in https://discourse.llvm.org/t/code-sharing-between-compiler-rt-and-clang-llvm/79935/9?u=boomanaiden154-1 so that we can actually share the code rather than just maintaining identical copies.

https://github.com/llvm/llvm-project/pull/97777