[turbofan] compute arguments length in deoptimizer

src/compiler/escape-analysis-reducer.cc

 // Copyright 2015 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/escape-analysis-reducer.h"
 
 #include "src/compiler/all-nodes.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/type-cache.h"
@@ skipping 393 matching lines @@
 
 void EscapeAnalysisReducer::Finalize() {
   for (Node* node : arguments_elements_) {
     DCHECK(node->opcode() == IrOpcode::kNewUnmappedArgumentsElements);
 
     Node* arguments_frame = NodeProperties::GetValueInput(node, 0);
     if (arguments_frame->opcode() != IrOpcode::kArgumentsFrame) continue;
     Node* arguments_length = NodeProperties::GetValueInput(node, 1);
     if (arguments_length->opcode() != IrOpcode::kArgumentsLength) continue;
 
+    Node* arguments_length_state = nullptr;
+    for (Edge edge : arguments_length->use_edges()) {
+      Node* use = edge.from();
+      switch (use->opcode()) {
+        case IrOpcode::kObjectState:
+        case IrOpcode::kTypedObjectState:
+        case IrOpcode::kStateValues:
+        case IrOpcode::kTypedStateValues:
+          if (!arguments_length_state) {
+            arguments_length_state = jsgraph()->graph()->NewNode(
+                jsgraph()->common()->ArgumentsLengthState(
+                    IsRestLengthOf(arguments_length->op())));
+            NodeProperties::SetType(arguments_length_state,
+                                    Type::OtherInternal());
+          }
+          edge.UpdateTo(arguments_length_state);
+          break;
+        default:
+          break;
+      }
+    }
+
     bool escaping_use = false;
     ZoneVector<Node*> loads(zone());
     for (Edge edge : node->use_edges()) {
       Node* use = edge.from();
       if (!NodeProperties::IsValueEdge(edge)) continue;
       if (use->use_edges().empty()) {
         // A node without uses is dead, so we don't have to care about it.
         continue;
       }
       switch (use->opcode()) {
@@ skipping 66 matching lines @@
             UNREACHABLE();
         }
       }
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8