[turbofan] Check node input/use consistency for changed operators and new nodes.

test/cctest/compiler/test-machine-operator-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 "test/cctest/cctest.h"
 
 #include "src/base/utils/random-number-generator.h"
 #include "src/codegen.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator-reducer.h"
@@ skipping 697 matching lines @@
 
   {
     MachineOperatorReducer reducer(&R.jsgraph);
     Reduction reduction = reducer.Reduce(load);
     CHECK(!reduction.Changed());  // loads should not be reduced.
   }
 
   {
     Node* store = R.graph.NewNode(
         R.machine.Store(StoreRepresentation(kMachInt32, kNoWriteBarrier)), base,
-        index, load, load, load);
+        index, load, load, R.graph.start());
     MachineOperatorReducer reducer(&R.jsgraph);
     Reduction reduction = reducer.Reduce(store);
     CHECK(!reduction.Changed());  // stores should not be reduced.
   }
 }
 
 
 // TODO(titzer): test MachineOperatorReducer for Word64And
 // TODO(titzer): test MachineOperatorReducer for Word64Or
 // TODO(titzer): test MachineOperatorReducer for Word64Xor
@@ skipping 12 matching lines @@
 // TODO(titzer): test MachineOperatorReducer for Uint64Mod
 // TODO(titzer): test MachineOperatorReducer for Int64Neg
 // TODO(titzer): test MachineOperatorReducer for ChangeInt32ToFloat64
 // TODO(titzer): test MachineOperatorReducer for ChangeFloat64ToInt32
 // TODO(titzer): test MachineOperatorReducer for Float64Compare
 // TODO(titzer): test MachineOperatorReducer for Float64Add
 // TODO(titzer): test MachineOperatorReducer for Float64Sub
 // TODO(titzer): test MachineOperatorReducer for Float64Mul
 // TODO(titzer): test MachineOperatorReducer for Float64Div
 // TODO(titzer): test MachineOperatorReducer for Float64Mod