[clang] [lld] [libcxxabi] [llvm] [flang] [clang-tools-extra] [openmp] [compiler-rt] [lldb] [libc] [libcxx] [mlir] [builtins][arm64] Build __init_cpu_features_resolver on Apple platforms (PR #73685)

[Jon Roelofs via cfe-commits]

jroelofs wrote:

> this file suffers from a pretty deep ifdef nesting jungle, so I'm not sure if that's the best solution

I'll refactor, and put up a new PR.

https://github.com/llvm/llvm-project/pull/73685