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

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/compilation-info.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/instruction-selector.h"
@@ skipping 68 matching lines @@
 
   // Initialize graph and builder.
   void Begin(int num_parameters) {
     CHECK_NULL(graph()->start());
     Node* start = graph()->NewNode(common()->Start(num_parameters + 3));
     graph()->SetStart(start);
     effect_ = start;
   }
 
   void Return(Node* value) {
-    return_ =
-        graph()->NewNode(common()->Return(), value, effect_, graph()->start());
+    Node* zero = graph()->NewNode(common()->Int32Constant(0));
+    return_ = graph()->NewNode(common()->Return(), zero, value, effect_,
+                               graph()->start());
     effect_ = NULL;
   }
 
   // Close the graph.
   void End() {
     Node* end = graph()->NewNode(common()->End(1), return_);
     graph()->SetEnd(end);
   }
 
   Node* PointerConstant(void* value) {
@@ skipping 205 matching lines @@
   Node* return_;
   Node** parameters_;
   MaybeHandle<Code> code_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_GRAPH_BUILDER_TESTER_H_