[llvm] [TargetLowering] Change subtraction to do (LHS < RHS) XOR (RESULT < 0) (PR #150872)

[Craig Topper via llvm-commits]

topperc wrote:

The title needs to include GlobalISel too since TargetLowering is a SelectionDAG file.

https://github.com/llvm/llvm-project/pull/150872