Make start node a value input to parameter nodes.

test/cctest/compiler/graph-builder-tester.h

 // 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.
 
 #ifndef V8_CCTEST_COMPILER_GRAPH_BUILDER_TESTER_H_
 #define V8_CCTEST_COMPILER_GRAPH_BUILDER_TESTER_H_
 
 #include "src/v8.h"
 #include "test/cctest/cctest.h"
 
@@ skipping 29 matching lines @@
   MachineCallHelper(Zone* zone, MachineCallDescriptorBuilder* builder);
 
   Node* Parameter(int offset);
 
  protected:
   virtual byte* Generate();
   virtual void VerifyParameters(int parameter_count,
                                 MachineRepresentation* parameters);
   void InitParameters(GraphBuilder* builder, CommonOperatorBuilder* common);
 
- private:
+ protected:
   int parameter_count() const {
     return call_descriptor_builder_->parameter_count();
   }
+
+ private:
   MachineCallDescriptorBuilder* call_descriptor_builder_;
   Node** parameters_;
   // TODO(dcarney): shouldn't need graph stored.
   Graph* graph_;
   MaybeHandle<Code> code_;
 };
 
 
 class GraphAndBuilders {
  public:
@@ skipping 26 matching lines @@
                               MachineRepresentation p3 = kMachineLast,
                               MachineRepresentation p4 = kMachineLast)
       : GraphAndBuilders(main_zone()),
         MachineCallHelper(
             main_zone(),
             ToCallDescriptorBuilder(
                 main_zone(), ReturnValueTraits<ReturnType>::Representation(),
                 p0, p1, p2, p3, p4)),
         SimplifiedGraphBuilder(main_graph_, &main_common_, &main_machine_,
                                &main_simplified_) {
-    Begin();
+    Begin(parameter_count());
     InitParameters(this, &main_common_);
   }
   virtual ~GraphBuilderTester() {}
 
   Factory* factory() const { return isolate()->factory(); }
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_GRAPH_BUILDER_TESTER_H_