[llvm] [AArch64][SVE] Optimize svand_z/svorr_z with all-true predicates. (PR #160408)

[Paul Walker via llvm-commits]

paulwalker-arm wrote:

Rather than adding these explicit combines do you mind trying to extend `constructSVEIntrinsicInfo` and probably `simplifySVEIntrinsicBinOp` to include coverage for the zeroing logical operations? It might not work out but if it does then we'll effectively get the core simplifications for free.

https://github.com/llvm/llvm-project/pull/160408