A change in the way we place TransitionElementKinds in the tree.

src/small-pointer-list.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 108 matching lines @@
     if ((data_ & kTagMask) == kEmptyTag) return;
     if ((data_ & kTagMask) == kSingletonTag) {
       if (pointer == single_value()) {
         data_ = kEmptyTag;
       }
       return;
     }
     list()->RemoveElement(pointer);
   }
 
+  void RemoveAt(int i) {
+    if ((data_ & kTagMask) == kEmptyTag) return;
+    if ((data_ & kTagMask) == kSingletonTag) {
+      ASSERT(i == 0);
+      data_ = kEmptyTag;
+      return;
+    }
+    list()->Remove(i);
+  }
+
   T* RemoveLast() {
     ASSERT((data_ & kTagMask) != kEmptyTag);
     if ((data_ & kTagMask) == kSingletonTag) {
       T* result = single_value();
       data_ = kEmptyTag;
       return result;
     }
     return list()->RemoveLast();
   }
 
@@ skipping 50 matching lines @@
   }
 
   intptr_t data_;
 
   DISALLOW_COPY_AND_ASSIGN(SmallPointerList);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SMALL_POINTER_LIST_H_