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

src/profile-generator.h

Index: src/profile-generator.h
===================================================================
--- src/profile-generator.h	(revision 7102)
+++ src/profile-generator.h	(working copy)
@@ -540,7 +540,10 @@
     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; }