Merge bleeding edge into the GC branch up to 7948. The asserts

src/global-handles.h

Index: src/global-handles.h
===================================================================
--- src/global-handles.h	(revision 7948)
+++ src/global-handles.h	(working copy)
@@ -146,6 +146,9 @@
   // Clear the weakness of a global handle.
   void ClearWeakness(Object** location);
 
+  // Clear the weakness of a global handle.
+  void MarkIndependent(Object** location);
+
   // Tells whether global handle is near death.
   static bool IsNearDeath(Object** location);
 
@@ -154,11 +157,14 @@
 
   // Process pending weak handles.
   // Returns true if next major GC is likely to collect more garbage.
-  bool PostGarbageCollectionProcessing();
+  bool PostGarbageCollectionProcessing(GarbageCollector collector);
 
   // Iterates over all strong handles.
   void IterateStrongRoots(ObjectVisitor* v);
 
+  // Iterates over all strong and dependent handles.
+  void IterateStrongAndDependentRoots(ObjectVisitor* v);
+
   // Iterates over all handles.
   void IterateAllRoots(ObjectVisitor* v);
 
@@ -168,6 +174,9 @@
   // Iterates over all weak roots in heap.
   void IterateWeakRoots(ObjectVisitor* v);
 
+  // Iterates over all weak independent roots in heap.
+  void IterateWeakIndependentRoots(ObjectVisitor* v);
+
   // Iterates over weak roots that are bound to a given callback.
   void IterateWeakRoots(WeakReferenceGuest f,
                         WeakReferenceCallback callback);
@@ -176,6 +185,10 @@
   // them as pending.
   void IdentifyWeakHandles(WeakSlotCallback f);
 
+  // Find all weak independent handles satisfying the callback predicate, mark
+  // them as pending.
+  void IdentifyWeakIndependentHandles(WeakSlotCallbackWithHeap f);
+
   // Add an object group.
   // Should be only used in GC callback function before a collection.
   // All groups are destroyed after a mark-compact collection.