Get rid of distinction between below- and above-watermark in page allocation....

src/profile-generator.h

 // Copyright 2010 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 522 matching lines @@
   void set_retained_size(int value) { retained_size_ = value; }
   int ordered_index() { return ordered_index_; }
   void set_ordered_index(int value) { ordered_index_ = value; }
 
   Vector<HeapGraphEdge> children() {
     return Vector<HeapGraphEdge>(children_arr(), children_count_); }
   Vector<HeapGraphEdge*> retainers() {
     return Vector<HeapGraphEdge*>(retainers_arr(), retainers_count_); }
   List<HeapGraphPath*>* GetRetainingPaths();
   HeapEntry* dominator() { return dominator_; }
-  void set_dominator(HeapEntry* entry) { dominator_ = entry; }
+  void set_dominator(HeapEntry* entry) {
+    ASSERT(entry != NULL);
+    dominator_ = entry;
+  }
 
   void clear_paint() { painted_ = kUnpainted; }
   bool painted_reachable() { return painted_ == kPainted; }
   void paint_reachable() {
     ASSERT(painted_ == kUnpainted);
     painted_ = kPainted;
   }
   bool not_painted_reachable_from_others() {
     return painted_ != kPaintedReachableFromOthers;
   }
@@ skipping 522 matching lines @@
 };
 
 
 String* GetConstructorNameForHeapProfile(JSObject* object);
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 #endif  // V8_PROFILE_GENERATOR_H_