[llvm] [SelectionDAG] Change SSUBO to do (LHS < RHS) XOR (RESULT < 0) (PR #191747)

[Jay Foad via llvm-commits]

jayfoad wrote:

What's the motivation for this? Is it supposed to generate better code overall? (If so, that is not obvious to me from skimming the codegen changes.)

https://github.com/llvm/llvm-project/pull/191747