Make start node a value input to parameter nodes.

src/compiler/raw-machine-assembler.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/pipeline.h"
 #include "src/compiler/raw-machine-assembler.h"
 #include "src/compiler/scheduler.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 RawMachineAssembler::RawMachineAssembler(
     Graph* graph, MachineCallDescriptorBuilder* call_descriptor_builder,
     MachineRepresentation word)
     : GraphBuilder(graph),
       schedule_(new (zone()) Schedule(zone())),
       machine_(zone(), word),
       common_(zone()),
       call_descriptor_builder_(call_descriptor_builder),
       parameters_(NULL),
       exit_label_(schedule()->exit()),
       current_block_(schedule()->entry()) {
+  Node* s = graph->NewNode(common_.Start(parameter_count()));
+  graph->SetStart(s);
   if (parameter_count() == 0) return;
   parameters_ = zone()->NewArray<Node*>(parameter_count());
   for (int i = 0; i < parameter_count(); ++i) {
-    parameters_[i] = NewNode(common()->Parameter(i));
+    parameters_[i] = NewNode(common()->Parameter(i), graph->start());
   }
 }
 
 
 Schedule* RawMachineAssembler::Export() {
   // Compute the correct codegen order.
   DCHECK(schedule_->rpo_order()->empty());
   Scheduler scheduler(zone(), graph(), schedule_);
   scheduler.ComputeSpecialRPO();
   // Invalidate MachineAssembler.
@@ skipping 110 matching lines @@
   Node* node = graph()->NewNode(op, input_count, inputs);
   BasicBlock* block = op->opcode() == IrOpcode::kParameter ? schedule()->start()
                                                            : CurrentBlock();
   schedule()->AddNode(block, node);
   return node;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8