[llvm] [AArch64] Expand vector ops when NEON and SVE are unavailable. (PR #90833)

[Paul Walker via llvm-commits]

https://github.com/paulwalker-arm approved this pull request.

Given the size of the generated code I think we might start to question the usefulness of some of the tests (e.g. testing v32i8 variants).

https://github.com/llvm/llvm-project/pull/90833