[llvm] [AArch64] Add FeatureZCRegMoveFPR128 subtarget feature (PR #152906)

[Jon Roelofs via llvm-commits]

jroelofs wrote:

> Its a preparation for future optimizations.

I have a small hesitation with this approach, since the lack of functional change along with it means this cannot be tested. I think it would be a lot healthier if this came with that change, as well as a test covering all these CPUs that have (and one that shows what happens when it doesn't). These feature lists can be a bit fragile with respect to refactoring + downstream changes... way too easy to lose things.

https://github.com/llvm/llvm-project/pull/152906