Factor out handling of mixed objects preprocessing after migration

src/heap/mark-compact.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_MARK_COMPACT_H_
 #define V8_HEAP_MARK_COMPACT_H_
 
 #include "src/base/bits.h"
 #include "src/heap/spaces.h"
 
@@ skipping 630 matching lines @@
   }
 
   void RecordRelocSlot(RelocInfo* rinfo, Object* target);
   void RecordCodeEntrySlot(Address slot, Code* target);
   void RecordCodeTargetPatch(Address pc, Code* target);
 
   INLINE(void RecordSlot(
       Object** anchor_slot, Object** slot, Object* object,
       SlotsBuffer::AdditionMode mode = SlotsBuffer::FAIL_ON_OVERFLOW));
 
+  void MigrateMixedObjectEpilog(HeapObject* dst);
+
   void MigrateObject(HeapObject* dst, HeapObject* src, int size,
                      AllocationSpace to_old_space);
 
   bool TryPromoteObject(HeapObject* object, int object_size);
 
   void InvalidateCode(Code* code);
 
   void ClearMarkbits();
 
   bool abort_incremental_marking() const { return abort_incremental_marking_; }
@@ skipping 344 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_MARK_COMPACT_H_