Make start node a value input to parameter 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/compiler/graph-inl.h"
 #include "src/compiler/machine-operator-reducer.h"
 #include "test/cctest/compiler/value-helper.h"
@@ skipping 12 matching lines @@
 
 template <>
 Operator* NewConstantOperator<double>(CommonOperatorBuilder* common,
                                       volatile double value) {
   return common->Float64Constant(value);
 }
 
 
 class ReducerTester : public HandleAndZoneScope {
  public:
-  ReducerTester()
+  explicit ReducerTester(int num_parameters = 0)
       : isolate(main_isolate()),
         binop(NULL),
         unop(NULL),
         machine(main_zone()),
         common(main_zone()),
         graph(main_zone()),
-        maxuint32(Constant<int32_t>(kMaxUInt32)) {}
+        maxuint32(Constant<int32_t>(kMaxUInt32)) {
+    Node* s = graph.NewNode(common.Start(num_parameters));
+    graph.SetStart(s);
+  }
 
   Isolate* isolate;
   Operator* binop;
   Operator* unop;
   MachineOperatorBuilder machine;
   CommonOperatorBuilder common;
   Graph graph;
   Node* maxuint32;
 
   template <typename T>
@@ skipping 110 matching lines @@
     Node* k = Constant<T>(constant);
     Node* n = graph.NewNode(binop, k, p);
     MachineOperatorReducer reducer(&graph);
     Reduction reduction = reducer.Reduce(n);
     CHECK(!reduction.Changed());
     CHECK_EQ(k, n->InputAt(0));
     CHECK_EQ(p, n->InputAt(1));
   }
 
   Node* Parameter(int32_t index = 0) {
-    return graph.NewNode(common.Parameter(index));
+    return graph.NewNode(common.Parameter(index), graph.start());
   }
 };
 
 
 TEST(ReduceWord32And) {
   ReducerTester R;
   R.binop = R.machine.Word32And();
 
   FOR_INT32_INPUTS(pl) {
     FOR_INT32_INPUTS(pr) {
@@ skipping 585 matching lines @@
 // TODO(titzer): test MachineOperatorReducer for Int64Mul
 // TODO(titzer): test MachineOperatorReducer for Int64UMul
 // TODO(titzer): test MachineOperatorReducer for Int64Div
 // TODO(titzer): test MachineOperatorReducer for Int64UDiv
 // TODO(titzer): test MachineOperatorReducer for Int64Mod
 // TODO(titzer): test MachineOperatorReducer for Int64UMod
 // TODO(titzer): test MachineOperatorReducer for Int64Neg
 // TODO(titzer): test MachineOperatorReducer for ChangeInt32ToFloat64
 // TODO(titzer): test MachineOperatorReducer for ChangeFloat64ToInt32
 // TODO(titzer): test MachineOperatorReducer for Float64Compare