Silence control reducer tracing a bit.

src/compiler/control-reducer.cc

 // Copyright 2014 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/common-operator.h"
 #include "src/compiler/control-reducer.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 enum VisitState { kUnvisited = 0, kOnStack = 1, kRevisit = 2, kVisited = 3 };
 enum Reachability { kFromStart = 8 };
 
 #define TRACE(x) \
-  if (FLAG_trace_turbo) PrintF x
+  if (FLAG_trace_turbo_reduction) PrintF x
 
 class ControlReducerImpl {
  public:
   ControlReducerImpl(Zone* zone, JSGraph* jsgraph,
                      CommonOperatorBuilder* common)
       : zone_(zone),
         jsgraph_(jsgraph),
         common_(common),
         state_(jsgraph->graph()->NodeCount(), kUnvisited, zone_),
         stack_(zone_),
@@ skipping 494 matching lines @@
 Node* ControlReducer::ReduceBranchForTesting(JSGraph* jsgraph,
                                              CommonOperatorBuilder* common,
                                              Node* node) {
   Zone zone(jsgraph->graph()->zone()->isolate());
   ControlReducerImpl impl(&zone, jsgraph, common);
   return impl.ReduceBranch(node);
 }
 }
 }
 }  // namespace v8::internal::compiler