[turbofan] Fix value output count for the Start node.

test/cctest/compiler/test-run-stubs.cc

 // Copyright 2015 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/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
@@ skipping 22 matching lines @@
   CallDescriptor* descriptor = Linkage::ComputeIncoming(zone, &info);
 
   // Create a function to call the code using the descriptor.
   Graph graph(zone);
   CommonOperatorBuilder common(zone);
   JSOperatorBuilder javascript(zone);
   MachineOperatorBuilder machine(zone);
   JSGraph js(isolate, &graph, &common, &javascript, &machine);
 
   // FunctionTester (ab)uses a 2-argument function
-  Node* start = graph.NewNode(common.Start(2));
+  Node* start = graph.NewNode(common.Start(4));
   // Parameter 0 is the number to round
   Node* numberParam = graph.NewNode(common.Parameter(1), start);
   Unique<HeapObject> u = Unique<HeapObject>::CreateImmovable(code);
   Node* theCode = graph.NewNode(common.HeapConstant(u));
   Node* dummyContext = graph.NewNode(common.NumberConstant(0.0));
   Node* call = graph.NewNode(common.Call(descriptor), theCode,
                              js.UndefinedConstant(), js.UndefinedConstant(),
                              numberParam, dummyContext, start, start);
   Node* ret = graph.NewNode(common.Return(), call, call, start);
   Node* end = graph.NewNode(common.End(1), ret);
@@ skipping 15 matching lines @@
   // Create code and an accompanying descriptor.
   StringLengthTFStub stub(isolate);
   Handle<Code> code = stub.GenerateCode();
   CompilationInfo info(&stub, isolate, zone);
   CallDescriptor* descriptor = Linkage::ComputeIncoming(zone, &info);
 
   // Create a function to call the code using the descriptor.
   Graph graph(zone);
   CommonOperatorBuilder common(zone);
   // FunctionTester (ab)uses a 4-argument function
-  Node* start = graph.NewNode(common.Start(4));
+  Node* start = graph.NewNode(common.Start(6));
   // Parameter 0 is the receiver
   Node* receiverParam = graph.NewNode(common.Parameter(1), start);
   Node* nameParam = graph.NewNode(common.Parameter(2), start);
   Node* slotParam = graph.NewNode(common.Parameter(3), start);
   Node* vectorParam = graph.NewNode(common.Parameter(4), start);
   Unique<HeapObject> u = Unique<HeapObject>::CreateImmovable(code);
   Node* theCode = graph.NewNode(common.HeapConstant(u));
   Node* dummyContext = graph.NewNode(common.NumberConstant(0.0));
   Node* call =
       graph.NewNode(common.Call(descriptor), theCode, receiverParam, nameParam,
@@ skipping 25 matching lines @@
   // Create code and an accompanying descriptor.
   StringAddTFStub stub(isolate, STRING_ADD_CHECK_BOTH, NOT_TENURED);
   Handle<Code> code = stub.GenerateCode();
   CompilationInfo info(&stub, isolate, zone);
   CallDescriptor* descriptor = Linkage::ComputeIncoming(zone, &info);
 
   // Create a function to call the code using the descriptor.
   Graph graph(zone);
   CommonOperatorBuilder common(zone);
   // FunctionTester (ab)uses a 2-argument function
-  Node* start = graph.NewNode(common.Start(2));
+  Node* start = graph.NewNode(common.Start(4));
   // Parameter 0 is the receiver
   Node* leftParam = graph.NewNode(common.Parameter(1), start);
   Node* rightParam = graph.NewNode(common.Parameter(2), start);
   Unique<HeapObject> u = Unique<HeapObject>::CreateImmovable(code);
   Node* theCode = graph.NewNode(common.HeapConstant(u));
   Node* dummyContext = graph.NewNode(common.NumberConstant(0.0));
   Node* call = graph.NewNode(common.Call(descriptor), theCode, leftParam,
                              rightParam, dummyContext, start, start);
   Node* ret = graph.NewNode(common.Return(), call, call, start);
   Node* end = graph.NewNode(common.End(1), ret);
   graph.SetStart(start);
   graph.SetEnd(end);
   FunctionTester ft(&graph);
 
   // Actuall call through to the stub, verifying its result.
   Handle<String> leftArg = ft.Val("links");
   Handle<String> rightArg = ft.Val("rechts");
   Handle<Object> result = ft.Call(leftArg, rightArg).ToHandleChecked();
   CHECK(String::Equals(ft.Val("linksrechts"), Handle<String>::cast(result)));
 }
 
 #endif  // V8_TURBOFAN_TARGET