address comment

Author: diggerlin

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -16266,8 +16266,8 @@ SDValue DAGCombiner::visitFREEZE(SDNode *N) {
   // Finally, recreate the node, it's operands were updated to use
   // frozen operands, so we just need to use it's "original" operands.
   SmallVector<SDValue> Ops(N0->ops());
-  // Special-handle ISD::UNDEF, ISD::POISON, each single one of them can be it's
-  // own thing.
+  // TODO: ISD::UNDEF and ISD::POISON should get separate handling, but best
+  // leave for a future patch.
   for (SDValue &Op : Ops) {
     if (Op.isUndef())
       Op = DAG.getFreeze(Op);

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -6262,7 +6262,6 @@ SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
     if (N1.isUndef())
       // sext(undef) = 0, because the top bits will all be the same.
       return getConstant(0, DL, VT);
-
     break;
   case ISD::ZERO_EXTEND:
     assert(VT.isInteger() && N1.getValueType().isInteger() &&