[llvm] [AArch64][GlobalISel] Perfect Shuffles (PR #106446)

[Amara Emerson via llvm-commits]

aemerson wrote:

> > I know nothing of aarch64 so I just have more nits
> 
> Yeah I appreciate you trying.
> 
> I might have a got at rewriting this to do away with the PerfectShuffleTables and just apply multiple shuffles in sequence.

I hadn't reviewed this because I was assuming there was another approach incoming. Is that happening or shall we continue with this?

https://github.com/llvm/llvm-project/pull/106446