[SCCP] Flip range arguments for NSW region check.

This brings the operand order in line with the NUW handling, which was
missed out in 72121a2.

At the moment this is NFC as we only additions, but it
should fix miscompiles with 024115a recommitted.

Author: fhahn

llvm/lib/Transforms/Utils/SCCPSolver.cpp

@@ -153,8 +153,8 @@ static bool refineInstruction(SCCPSolver &Solver,
   }
   if (!Inst.hasNoSignedWrap()) {
     auto NSWRange = ConstantRange::makeGuaranteedNoWrapRegion(
-        Instruction::Add, RangeA, OverflowingBinaryOperator::NoSignedWrap);
-    if (NSWRange.contains(RangeB)) {
+        Instruction::Add, RangeB, OverflowingBinaryOperator::NoSignedWrap);
+    if (NSWRange.contains(RangeA)) {
       Inst.setHasNoSignedWrap();
       Changed = true;
     }