[turbofan] compute arguments length in deoptimizer

src/compiler/instruction.h

Index: src/compiler/instruction.h
diff --git a/src/compiler/instruction.h b/src/compiler/instruction.h
index 1299995891ee6331c2c359f3c4a38858ee25ee9b..78496c0226f065123e855c678c4626f8d795bc4a 100644
--- a/src/compiler/instruction.h
+++ b/src/compiler/instruction.h
@@ -1126,6 +1126,7 @@ class FrameStateDescriptor;
 
 enum class StateValueKind : uint8_t {
   kArgumentsElements,
+  kArgumentsLength,
   kPlain,
   kOptimizedOut,
   kNested,
@@ -1143,6 +1144,12 @@ class StateValueDescriptor {
     descr.is_rest_ = is_rest;
     return descr;
   }
+  static StateValueDescriptor ArgumentsLength(bool is_rest) {
+    StateValueDescriptor descr(StateValueKind::kArgumentsLength,
+                               MachineType::AnyTagged());
+    descr.is_rest_ = is_rest;
+    return descr;
+  }
   static StateValueDescriptor Plain(MachineType type) {
     return StateValueDescriptor(StateValueKind::kPlain, type);
   }
@@ -1166,6 +1173,9 @@ class StateValueDescriptor {
   bool IsArgumentsElements() const {
     return kind_ == StateValueKind::kArgumentsElements;
   }
+  bool IsArgumentsLength() const {
+    return kind_ == StateValueKind::kArgumentsLength;
+  }
   bool IsPlain() const { return kind_ == StateValueKind::kPlain; }
   bool IsOptimizedOut() const { return kind_ == StateValueKind::kOptimizedOut; }
   bool IsNested() const { return kind_ == StateValueKind::kNested; }
@@ -1177,7 +1187,8 @@ class StateValueDescriptor {
     return id_;
   }
   int is_rest() const {
-    DCHECK(kind_ == StateValueKind::kArgumentsElements);
+    DCHECK(kind_ == StateValueKind::kArgumentsElements ||
+           kind_ == StateValueKind::kArgumentsLength);
     return is_rest_;
   }
 
@@ -1252,6 +1263,9 @@ class StateValueList {
   void PushArgumentsElements(bool is_rest) {
     fields_.push_back(StateValueDescriptor::ArgumentsElements(is_rest));
   }
+  void PushArgumentsLength(bool is_rest) {
+    fields_.push_back(StateValueDescriptor::ArgumentsLength(is_rest));
+  }
   void PushDuplicate(size_t id) {
     fields_.push_back(StateValueDescriptor::Duplicate(id));
   }