[llvm] [LLVM][SVE][CodeGen] Fix incorrect isel for signed saturating instructions. (PR #88136)

[David Green via llvm-commits]

davemgreen wrote:

This certainly sounds like one of those problems that is easy to get wrong. It sounds like the generation of the intrinsics in clang might need to change too?

https://github.com/llvm/llvm-project/pull/88136