[llvm] [AArch64][SelectionDAG][SVE] Fold following extend(icmp) patterns (PR #192052)

[Ricardo Jesus via llvm-commits]

https://github.com/rj-jesus commented:

Thanks for the changes. Could you move the new code to its own method, for example `performExtendSetccMergeZeroCombine`, to keep in line with the rest of the code in `performExtendCombine`?

https://github.com/llvm/llvm-project/pull/192052