Make heap iterable in PrepareForBreakPoints.

src/mark-compact.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 431 matching lines @@
 
   // Prepares for GC by resetting relocation info in old and map spaces and
   // choosing spaces to compact.
   void Prepare(GCTracer* tracer);
 
   // Performs a global garbage collection.
   void CollectGarbage();
 
   bool StartCompaction();
 
+  void AbortCompaction();
+
   // During a full GC, there is a stack-allocated GCTracer that is used for
   // bookkeeping information.  Return a pointer to that tracer.
   GCTracer* tracer() { return tracer_; }
 
 #ifdef DEBUG
   // Checks whether performing mark-compact collection.
   bool in_use() { return state_ > PREPARE_GC; }
   bool are_map_pointers_encoded() { return state_ == UPDATE_POINTERS; }
 #endif
 
@@ skipping 301 matching lines @@
 
   friend class Heap;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_