Fastpath some spread-call desugaring.

src/isolate.h

 // Copyright 2012 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_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 
@@ skipping 969 matching lines @@
 
   void set_date_cache(DateCache* date_cache) {
     if (date_cache != date_cache_) {
       delete date_cache_;
     }
     date_cache_ = date_cache;
   }
 
   Map* get_initial_js_array_map(ElementsKind kind);
 
-  static const int kArrayProtectorValid = 1;
-  static const int kArrayProtectorInvalid = 0;
+  static const int kProtectorValid = 1;
+  static const int kProtectorInvalid = 0;
 
   bool IsFastArrayConstructorPrototypeChainIntact();
   inline bool IsArraySpeciesLookupChainIntact();
   inline bool IsHasInstanceLookupChainIntact();
   bool IsIsConcatSpreadableLookupChainIntact();
   bool IsIsConcatSpreadableLookupChainIntact(JSReceiver* receiver);
   inline bool IsStringLengthOverflowIntact();
+  inline bool IsArrayIteratorLookupChainIntact();
 
   // Avoid deopt loops if fast Array Iterators migrate to slow Array Iterators.
   inline bool IsFastArrayIterationIntact();
 
   // On intent to set an element in object, make sure that appropriate
   // notifications occur if the set is on the elements of the array or
   // object prototype. Also ensure that changes to prototype chain between
   // Array and Object fire notifications.
   void UpdateArrayProtectorOnSetElement(Handle<JSObject> object);
   void UpdateArrayProtectorOnSetLength(Handle<JSObject> object) {
     UpdateArrayProtectorOnSetElement(object);
   }
   void UpdateArrayProtectorOnSetPrototype(Handle<JSObject> object) {
     UpdateArrayProtectorOnSetElement(object);
   }
   void UpdateArrayProtectorOnNormalizeElements(Handle<JSObject> object) {
     UpdateArrayProtectorOnSetElement(object);
   }
   void InvalidateArraySpeciesProtector();
   void InvalidateHasInstanceProtector();
   void InvalidateIsConcatSpreadableProtector();
   void InvalidateStringLengthOverflowProtector();
+  void InvalidateArrayIteratorProtector();
 
   // Returns true if array is the initial array prototype in any native context.
   bool IsAnyInitialArrayPrototype(Handle<JSArray> array);
 
   CallInterfaceDescriptorData* call_descriptor_data(int index);
 
   AccessCompilerData* access_compiler_data() { return access_compiler_data_; }
 
   void IterateDeferredHandles(ObjectVisitor* visitor);
   void LinkDeferredHandles(DeferredHandles* deferred_handles);
@@ skipping 645 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_