Fix live bytes counter in large object space after right trimming.

src/heap/spaces.h

 // Copyright 2011 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_SPACES_H_
 #define V8_HEAP_SPACES_H_
 
 #include <list>
 
 #include "src/allocation.h"
@@ skipping 3039 matching lines @@
 
   // Checks whether a heap object is in this space; O(1).
   bool Contains(HeapObject* obj);
   // Checks whether an address is in the object area in this space. Iterates
   // all objects in the space. May be slow.
   bool ContainsSlow(Address addr) { return FindObject(addr)->IsHeapObject(); }
 
   // Checks whether the space is empty.
   bool IsEmpty() { return first_page_ == NULL; }
 
+  void AdjustLiveBytes(int by) { objects_size_ += by; }
+
   LargePage* first_page() { return first_page_; }
 
 #ifdef VERIFY_HEAP
   virtual void Verify();
 #endif
 
 #ifdef DEBUG
   void Print() override;
   void ReportStatistics();
   void CollectCodeStatistics();
@@ skipping 72 matching lines @@
     count = 0;
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_SPACES_H_