[MachineBasicBlock] Fix a typo in function copySuccessor

[Carrot]

Summary

The condition used decide if need to copy probability should be reversed. Looks like a typo.

[xur]

Yes. This looks a typo to me too.

LGTM.

llvm/lib/CodeGen/MachineBasicBlock.cpp

if (!Probs.empty()) {
     if (!ProbIter->isUnknown())
       *ProbIter += *getProbabilityIterator(OldI);
   }
   removeSuccessor(OldI);
 }
 
 void MachineBasicBlock::copySuccessor(MachineBasicBlock *Orig,
                                       succ_iterator I) {
-  if (Orig->Probs.empty())
+  if (!Orig->Probs.empty())
     addSuccessor(*I, Orig->getSuccProbability(I));
   else
     addSuccessorWithoutProb(*I);
 }
 
 void MachineBasicBlock::addPredecessor(MachineBasicBlock *Pred) {
   Predecessors.push_back(Pred);
 }