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

test/cctest/compiler/simplified-graph-builder.cc

Index: test/cctest/compiler/simplified-graph-builder.cc
diff --git a/test/cctest/compiler/simplified-graph-builder.cc b/test/cctest/compiler/simplified-graph-builder.cc
index 2847dc7a2789ef95f4a0ee1f2f08e4070025dd21..4d57719effa44aedadd4edd6e94fc681c7ed3371 100644
--- a/test/cctest/compiler/simplified-graph-builder.cc
+++ b/test/cctest/compiler/simplified-graph-builder.cc
@@ -23,7 +23,7 @@ SimplifiedGraphBuilder::SimplifiedGraphBuilder(
 
 void SimplifiedGraphBuilder::Begin(int num_parameters) {
   DCHECK(graph()->start() == NULL);
-  Node* start = graph()->NewNode(common()->Start(num_parameters));
+  Node* start = graph()->NewNode(common()->Start(num_parameters + 3));
   graph()->SetStart(start);
   effect_ = start;
 }