[llvm] [AArch64][SVE] Add more MOVPRFX pseudos for SVE immediate instructions. (PR #192491)

[Ricardo Jesus via llvm-commits]

rj-jesus wrote:

> The test changes show some regressions.

Indeed, I wasn't sure how to avoid them. If you have any ideas you'd like me to try, please let me know. :) (For what it's worth, we did see a few speedups with #188579.)

> I suppose we're at a point where we cannot introduce new DestructiveInstTypes without also adding register allocation hints for them at the same time?

I included the hints due to it being a minor code change and to avoid some regressions, but I'm happy to drop them from the PR, or commit them separately, if that would be preferable?

https://github.com/llvm/llvm-project/pull/192491