[turbofan] Drop obsolete test after r24236.

test/cctest/compiler/test-graph-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/v8.h"
 
 #include "graph-tester.h"
 #include "src/compiler/generic-node-inl.h"
 #include "src/compiler/graph-reducer.h"
 
@@ skipping 603 matching lines @@
     for (int i = 0; i < 3; i++) {
       int before = graph.NodeCount();
       reducer.ReduceGraph();
       CHECK_EQ(before, graph.NodeCount());
       CHECK_EQ(&OPC0, n1->op());
       CHECK_EQ(&OPC1, end->op());
       CHECK_EQ(n1, end->InputAt(0));
     }
   }
 }
-
-
-// Tests that a reducer is only applied once.
-class OneTimeReducer : public Reducer {
- public:
-  OneTimeReducer(Reducer* reducer, Zone* zone)
-      : reducer_(reducer),
-        nodes_(NodeSet::key_compare(), NodeSet::allocator_type(zone)) {}
-  virtual Reduction Reduce(Node* node) {
-    CHECK_EQ(0, static_cast<int>(nodes_.count(node)));
-    nodes_.insert(node);
-    return reducer_->Reduce(node);
-  }
-  Reducer* reducer_;
-  NodeSet nodes_;
-};
-
-
-TEST(OneTimeReduce1) {
-  GraphTester graph;
-
-  Node* n1 = graph.NewNode(&OPA0);
-  Node* end = graph.NewNode(&OPA1, n1);
-  graph.SetEnd(end);
-
-  GraphReducer reducer(&graph);
-  InPlaceABReducer r;
-  OneTimeReducer once(&r, graph.zone());
-  reducer.AddReducer(&once);
-
-  // Tests A* => B* with in-place updates. Should only be applied once.
-  int before = graph.NodeCount();
-  reducer.ReduceGraph();
-  CHECK_EQ(before, graph.NodeCount());
-  CHECK_EQ(&OPB0, n1->op());
-  CHECK_EQ(&OPB1, end->op());
-  CHECK_EQ(n1, end->InputAt(0));
-}