[llvm] [TargetLowering] Change SSUBO to do (LHS < RHS) XOR (RESULT < 0) (PR #191672)

[Craig Topper via llvm-commits]

topperc wrote:

Don't put GISel and SelectionDAG changes in the same PR. They tend to have different reviewers.

https://github.com/llvm/llvm-project/pull/191672