Added missed full stop

[BenJMudd]

Accidentally created a new revision instead of updating the old one, my fault.

llvm/lib/Transforms/Scalar/JumpThreading.cpp

 JumpThreadingPass::cloneInstructions(BasicBlock::iterator BI,
                                      BasicBlock::iterator BE, BasicBlock *NewBB,
                                      BasicBlock *PredBB) {
   // We are going to have to map operands from the source basic block to the new
   // copy of the block 'NewBB'.  If there are PHI nodes in the source basic
   // block, evaluate them to account for entry from PredBB.
   DenseMap<Instruction *, Value *> ValueMapping;
 
-  // Retargets llvm.dbg.value to any renamed variables
+  // Retargets llvm.dbg.value to any renamed variables.
   auto retargetDbgValueIfPossible = [&](Instruction *NewInst) -> bool {
     auto dbgInstruction = dyn_cast<DbgValueInst>(NewInst);
     if (!dbgInstruction)
       return false;
 
     auto dbgValue = dyn_cast<Instruction>(dbgInstruction->getValue());
     if (!dbgValue)
       return false;