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

test/unittests/compiler/graph-reducer-unittest.cc

 // 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.
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/operator.h"
 #include "test/unittests/compiler/graph-reducer-unittest.h"
@@ skipping 272 matching lines @@
 const Operator kMockOpControl(IrOpcode::kDead, Operator::kNoProperties,
                               "MockOpControl", 0, 0, 1, 1, 0, 1);
 
 }  // namespace
 
 
 TEST_F(AdvancedReducerTest, ReplaceWithValue_ValueUse) {
   CommonOperatorBuilder common(zone());
   Node* node = graph()->NewNode(&kMockOperator);
   Node* start = graph()->NewNode(common.Start(1));
-  Node* use_value = graph()->NewNode(common.Return(), node, start, start);
+  Node* zero = graph()->NewNode(common.Int32Constant(0));
+  Node* use_value = graph()->NewNode(common.Return(), zero, node, start, start);
   Node* replacement = graph()->NewNode(&kMockOperator);
   GraphReducer graph_reducer(zone(), graph(), nullptr);
   ReplaceWithValueReducer r(&graph_reducer);
   r.ReplaceWithValue(node, replacement);
-  EXPECT_EQ(replacement, use_value->InputAt(0));
+  EXPECT_EQ(replacement, use_value->InputAt(1));
   EXPECT_EQ(0, node->UseCount());
   EXPECT_EQ(1, replacement->UseCount());
   EXPECT_THAT(replacement->uses(), ElementsAre(use_value));
 }
 
 
 TEST_F(AdvancedReducerTest, ReplaceWithValue_EffectUse) {
   CommonOperatorBuilder common(zone());
   Node* start = graph()->NewNode(common.Start(1));
   Node* node = graph()->NewNode(&kMockOpEffect, start);
@@ skipping 541 matching lines @@
       EXPECT_EQ(&kOpC0, n1->op());
       EXPECT_EQ(&kOpC1, end->op());
       EXPECT_EQ(n1, end->InputAt(0));
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8