[llvm] [SelectionDAG] Lowering usub.sat(a, 1) to a - (a != 0) (PR #170076)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon requested changes to this pull request.

Please can you regenerate llvm/test/CodeGen/X86/combine-sub-usat.ll now thath we have vector handling

https://github.com/llvm/llvm-project/pull/170076