[turbofan] compute arguments length in deoptimizer

src/compiler/common-operator.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/assembler.h"
 #include "src/base/lazy-instance.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/node.h"
@@ skipping 1221 matching lines @@
       TypedStateValueInfo(types, bitmask));            // parameters
 }
 
 const Operator* CommonOperatorBuilder::ArgumentsElementsState(bool is_rest) {
   return new (zone()) Operator1<bool>(                     // --
       IrOpcode::kArgumentsElementsState, Operator::kPure,  // opcode
       "ArgumentsElementsState",                            // name
       0, 0, 0, 1, 0, 0, is_rest);                          // counts
 }
 
+const Operator* CommonOperatorBuilder::ArgumentsLengthState(bool is_rest) {
+  return new (zone()) Operator1<bool>(                   // --
+      IrOpcode::kArgumentsLengthState, Operator::kPure,  // opcode
+      "ArgumentsLengthState",                            // name
+      0, 0, 0, 1, 0, 0, is_rest);                        // counts
+}
+
 bool IsRestOf(Operator const* op) {
-  DCHECK(op->opcode() == IrOpcode::kArgumentsElementsState);
+  DCHECK(op->opcode() == IrOpcode::kArgumentsElementsState ||
+         op->opcode() == IrOpcode::kArgumentsLengthState);
   return OpParameter<bool>(op);
 }
 
 const Operator* CommonOperatorBuilder::ObjectState(int pointer_slots) {
   return new (zone()) Operator1<int>(           // --
       IrOpcode::kObjectState, Operator::kPure,  // opcode
       "ObjectState",                            // name
       pointer_slots, 0, 0, 1, 0, 0,             // counts
       pointer_slots);                           // parameter
 }
@@ skipping 99 matching lines @@
 CommonOperatorBuilder::CreateFrameStateFunctionInfo(
     FrameStateType type, int parameter_count, int local_count,
     Handle<SharedFunctionInfo> shared_info) {
   return new (zone()->New(sizeof(FrameStateFunctionInfo)))
       FrameStateFunctionInfo(type, parameter_count, local_count, shared_info);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8