[llvm] [AArch64][SVE] Fold nested boolean UMIN trees (PR #209234)

[Matthew Devereau via llvm-commits]

MDevereau wrote:

> Looks good to me. Not sure if you see this in real code but logical_umin_with_umin_2 shows a possible extension whereby nested clamp operations can be simplified to a single clamp of the smallest value.

I haven't seen it in real code but I'm happy to follow up with it since it sounds easy.

https://github.com/llvm/llvm-project/pull/209234