[llvm] [AArch64][SVE] Fold integer lane extract and store to FPR store (PR #129756)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

> I feel like I've said this before but why is this not just a DAG combine? Some of the results look preferable regardless of streaming requirements.

I was simply implementing it in a similar manner to the existing Neon patterns. Most of these patterns are enabled for non-streaming case, I hadn't enabled the non-zero extract case, since it looks like it might not be worthwhile, but it seems like DUP could have throughput, so I'll enable that too. 

https://github.com/llvm/llvm-project/pull/129756