[turbofan] Renamed tracing flags for TurboFan reducers and graph trimmer

src/compiler/graph-trimmer.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/graph-trimmer.h"
 
 #include "src/compiler/graph.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 15 matching lines @@
   for (size_t i = 0; i < live_.size(); ++i) {
     Node* const live = live_[i];
     for (Node* const input : live->inputs()) MarkAsLive(input);
   }
   // Remove dead->live edges.
   for (Node* const live : live_) {
     DCHECK(IsLive(live));
     for (Edge edge : live->use_edges()) {
       Node* const user = edge.from();
       if (!IsLive(user)) {
-        if (FLAG_trace_turbo_reduction) {
+        if (FLAG_trace_turbo_trimming) {
           OFStream os(stdout);
           os << "DeadLink: " << *user << "(" << edge.index() << ") -> " << *live
              << std::endl;
         }
         edge.UpdateTo(nullptr);
       }
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8