[turbofan] Support variable size argument popping in TF-generated functions

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 ef85c0743cb3d73012593e6b65047d1f408b96a9..ab2a1f6dfe09b5bbf481bbbb087d1ff3883bc041 100644
--- a/test/cctest/compiler/test-representation-change.cc
+++ b/test/cctest/compiler/test-representation-change.cc
@@ -84,8 +84,8 @@ class RepresentationChangerTester : public HandleAndZoneScope,
   }
 
   Node* Return(Node* input) {
-    Node* n = graph()->NewNode(common()->Return(), input, graph()->start(),
-                               graph()->start());
+    Node* n = graph()->NewNode(common()->Return(), jsgraph()->Int32Constant(0),
+                               input, graph()->start(), graph()->start());
     return n;
   }