[ARM][NEON] NEON lowering doesn't legalize ISD::ABDS/ABDU nodes

[RKSimon]

Noticed while working #92576 - MVE supports these nodes, but NEON doesn't and just has support for the int_arm_neon_vabds/int_arm_neon_vabdu intrinsics and a couple of hardcoded patterns to support the VABDL extension instructions.

[llvmbot]

@llvm/issue-subscribers-backend-arm

Author: Simon Pilgrim (RKSimon)

Noticed while working #92576 - MVE supports these nodes, but NEON doesn't and just has support for the int_arm_neon_vabds/int_arm_neon_vabdu intrinsics and a couple of hardcoded patterns to support the VABDL extension instructions.