Change comments

Author: arsenm

llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp

@@ -6057,11 +6057,11 @@ SDValue DAGTypeLegalizer::WidenVecRes_LOOP_DEPENDENCE_MASK(SDNode *N) {
 
 SDValue DAGTypeLegalizer::WidenVecRes_BUILD_VECTOR(SDNode *N) {
   SDLoc dl(N);
-  // Build a vector with undefined for the new nodes.
+  // Build a vector with poison for the new nodes.
   EVT VT = N->getValueType(0);
 
   // Integer BUILD_VECTOR operands may be larger than the node's vector element
-  // type. The UNDEFs need to have the same type as the existing operands.
+  // type. The POISONs need to have the same type as the existing operands.
   EVT EltVT = N->getOperand(0).getValueType();
   unsigned NumElts = VT.getVectorNumElements();