[clang] [clang] [ARM] Explicitly enable NEON for Windows/Darwin targets (PR #122095)

[David Spickett via cfe-commits]

DavidSpickett wrote:

Or is it that this change allows other downstreams to patch the Linux issue in a way that does not break Windows and iOS in the process?

If I'm using clang on Debian, that's where I would find this C can use Neon but assembly cannot problem.

https://github.com/llvm/llvm-project/pull/122095