[turbofan] Fix typo in ControlReducer.

test/cctest/compiler/test-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/v8.h"
 #include "test/cctest/cctest.h"
 
 #include "src/base/bits.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/control-reducer.h"
@@ skipping 1171 matching lines @@
         Diamond d2(R, R.jsgraph.Int32Constant(b));
         d2.nest(d1, c);
 
         R.ReduceMergeIterative(R.start, d1.merge);
       }
     }
   }
 }
 
 
-TEST(CDeadDiamond) {
+TEST(CUnusedDiamond1) {
   ControlReducerTester R;
   // if (p0) { } else { }
-  Diamond d(R, R.p0);
-  R.ReduceMergeIterative(R.start, d.merge);
+  Node* branch = R.graph.NewNode(R.common.Branch(), R.p0, R.start);
+  Node* if_true = R.graph.NewNode(R.common.IfTrue(), branch);
+  Node* if_false = R.graph.NewNode(R.common.IfFalse(), branch);
+  Node* merge = R.graph.NewNode(R.common.Merge(2), if_true, if_false);
+  R.ReduceMergeIterative(R.start, merge);
 }
 
 
+TEST(CUnusedDiamond2) {
+  ControlReducerTester R;
+  // if (p0) { } else { }
+  Node* branch = R.graph.NewNode(R.common.Branch(), R.p0, R.start);
+  Node* if_true = R.graph.NewNode(R.common.IfTrue(), branch);
+  Node* if_false = R.graph.NewNode(R.common.IfFalse(), branch);
+  Node* merge = R.graph.NewNode(R.common.Merge(2), if_false, if_true);
+  R.ReduceMergeIterative(R.start, merge);
+}
+
+
 TEST(CDeadLoop1) {
   ControlReducerTester R;
 
   Node* loop = R.graph.NewNode(R.common.Loop(1), R.start);
   Branch b(R, R.p0, loop);
   loop->ReplaceInput(0, b.if_true);  // loop is not connected to start.
   Node* merge = R.graph.NewNode(R.common.Merge(2), R.start, b.if_false);
   R.ReduceMergeIterative(R.start, merge);
   CHECK(b.if_true->IsDead());
   CHECK(b.if_false->IsDead());
@@ skipping 297 matching lines @@
 
   Node* ret = R.Return(d1.phi, R.start, d1.merge);
 
   R.ReduceGraph();  // d1 gets folded true.
 
   CheckInputs(ret, y2, R.start, R.start);
   CheckDeadDiamond(d1);
   CheckDeadDiamond(d2);
   CheckDeadDiamond(d3);
 }