Turn Scope::locals_ into a ThreadedList

src/utils.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_UTILS_H_
 #define V8_UTILS_H_
 
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 1630 matching lines @@
   };
 
   Iterator begin() { return Iterator(&head_); }
   Iterator end() { return Iterator(tail_); }
 
   void Rewind(Iterator reset_point) {
     tail_ = reset_point.entry_;
     *tail_ = nullptr;
   }
 
+  void MoveTail(ThreadedList<T>* parent, Iterator location) {
+    if (parent->end() != location) {
+      DCHECK_NULL(*tail_);
+      *tail_ = *location;
+      tail_ = parent->tail_;
+      parent->Rewind(location);
+    }
+  }
+
   bool is_empty() const { return head_ == nullptr; }
 
   // Slow. For testing purposes.
   int LengthForTest() {
     int result = 0;
     for (Iterator t = begin(); t != end(); ++t) ++result;
     return result;
   }
   T* AtForTest(int i) {
     Iterator t = begin();
     while (i-- > 0) ++t;
     return *t;
   }
 
  private:
   T* head_;
   T** tail_;
   DISALLOW_COPY_AND_ASSIGN(ThreadedList);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UTILS_H_