Make start node a value input to parameter nodes.

test/cctest/compiler/test-representation-change.cc

Index: test/cctest/compiler/test-representation-change.cc
diff --git a/test/cctest/compiler/test-representation-change.cc b/test/cctest/compiler/test-representation-change.cc
index 7311890538f7e429ceb775291c605c3911c02502..d28cf4b4b82001c1473a3149cf85bd5a68bc4d00 100644
--- a/test/cctest/compiler/test-representation-change.cc
+++ b/test/cctest/compiler/test-representation-change.cc
@@ -22,11 +22,13 @@ namespace compiler {
 class RepresentationChangerTester : public HandleAndZoneScope,
                                     public GraphAndBuilders {
  public:
-  RepresentationChangerTester()
+  explicit RepresentationChangerTester(int num_parameters = 0)
       : GraphAndBuilders(main_zone()),
         typer_(main_zone()),
         jsgraph_(main_graph_, &main_common_, &typer_),
         changer_(&jsgraph_, &main_simplified_, &main_machine_, main_isolate()) {
+    Node* s = graph()->NewNode(common()->Start(num_parameters));
+    graph()->SetStart(s);
   }
 
   Typer typer_;
@@ -60,7 +62,7 @@ class RepresentationChangerTester : public HandleAndZoneScope,
   }
 
   Node* Parameter(int index = 0) {
-    return graph()->NewNode(common()->Parameter(index));
+    return graph()->NewNode(common()->Parameter(index), graph()->start());
   }
 
   void CheckTypeError(RepTypeUnion from, RepTypeUnion to) {