[SystemZ] Fix commit message of previous commit.

Sorry, the commit comment for r332703 is completely broken.
My mind slipped - the right description would be:

In SystemZDAGToDAGISel::Select(), in the handling for SELECT_CCMASK:

Check if UpdateNodeOperands() returns a different SDNode and in that
case call ReplaceNode.

Review: Ulrich Weigand.
llvm-svn: 332706

llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp

@@ -1512,7 +1512,7 @@ void SystemZDAGToDAGISel::Select(SDNode *Node) {
       SDNode *UpdatedNode =
         CurDAG->UpdateNodeOperands(Node, Op1, Op0, CCValid, CCMask, Op4);
       if (UpdatedNode != Node) {
-        // In case this node already exists, replace Node with it.
+        // In case this node already exists then replace Node with it.
         ReplaceNode(Node, UpdatedNode);
         Node = UpdatedNode;
       }