[clang-format][NFC] Rename variable so no shadowing happens

[HazardyKnusperkeks]

Summary

In the loop there is also a Node.

[curdeius]

LGTM.

clang/lib/Format/UnwrappedLineFormatter.cpp

unsigned analyzeSolutionSpace(LineState &InitialState, bool DryRun) {
     std::set<LineState *, CompareLineStatePointers> Seen;
 
     // Increasing count of \c StateNode items we have created. This is used to
     // create a deterministic order independent of the container.
     unsigned Count = 0;
     QueueType Queue;
 
     // Insert start element into queue.
-    StateNode *Node =
+    StateNode *RootNode =
         new (Allocator.Allocate()) StateNode(InitialState, false, nullptr);
-    Queue.push(QueueItem(OrderedPenalty(0, Count), Node));
+    Queue.push(QueueItem(OrderedPenalty(0, Count), RootNode));
     ++Count;
 
     unsigned Penalty = 0;
 
     // While not empty, take first element and follow edges.
     while (!Queue.empty()) {
       Penalty = Queue.top().first.first;
       StateNode *Node = Queue.top().second;