Merge (7180:7265] from bleeding_edge to the experimental/gc branch....

src/profile-generator.h

Index: src/profile-generator.h
===================================================================
--- src/profile-generator.h	(revision 7557)
+++ src/profile-generator.h	(working copy)
@@ -1034,11 +1034,13 @@
   void SetInternalReference(HeapObject* parent_obj,
                             HeapEntry* parent,
                             const char* reference_name,
-                            Object* child);
+                            Object* child,
+                            int field_offset = -1);
   void SetInternalReference(HeapObject* parent_obj,
                             HeapEntry* parent,
                             int index,
-                            Object* child);
+                            Object* child,
+                            int field_offset = -1);
   void SetHiddenReference(HeapObject* parent_obj,
                           HeapEntry* parent,
                           int index,
@@ -1046,7 +1048,8 @@
   void SetPropertyReference(HeapObject* parent_obj,
                             HeapEntry* parent,
                             String* reference_name,
-                            Object* child);
+                            Object* child,
+                            int field_offset = -1);
   void SetPropertyShortcutReference(HeapObject* parent_obj,
                                     HeapEntry* parent,
                                     String* reference_name,
@@ -1060,9 +1063,6 @@
   HeapSnapshot* snapshot_;
   HeapSnapshotsCollection* collection_;
   SnapshottingProgressReportingInterface* progress_;
-  // Used during references extraction to mark heap objects that
-  // are references via non-hidden properties.
-  HeapObjectsSet known_references_;
   SnapshotFillerInterface* filler_;
 
   static HeapObject* const kGcRootsObject;