[llvm] [AArch64][SVE2] Generate SVE2 BSL instruction in LLVM for add/sub. (PR #88413)

[David Sherwood via llvm-commits]

david-arm wrote:

This is just a thought, but SVE2 also has NBSL which is essentially just NOT(BSL). Is there any value in adding new patterns for this too?

https://github.com/llvm/llvm-project/pull/88413