!fixup add comment regarding folding.

Author: fhahn

llvm/lib/Transforms/Scalar/LICM.cpp

@@ -2880,6 +2880,7 @@ static bool hoistBOAssociation(Instruction &I, Loop &L,
   } else if (Opcode == Instruction::Or) {
     bool Disjoint = cast<PossiblyDisjointInst>(BO)->isDisjoint() &&
                     cast<PossiblyDisjointInst>(BO0)->isDisjoint();
+    // If `Inv` was not constant-folded, a new Instruction has been created.
     if (auto *I = dyn_cast<PossiblyDisjointInst>(Inv))
       I->setIsDisjoint(Disjoint);
     cast<PossiblyDisjointInst>(NewBO)->setIsDisjoint(Disjoint);