Refactor the functions related to collecting code statistics to a new class.

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 2221 matching lines @@
   void Allocate(int bytes) { accounting_stats_.AllocateBytes(bytes); }
 
   void IncreaseCapacity(int size);
 
   // Releases an unused page and shrinks the space.
   void ReleasePage(Page* page);
 
   // The dummy page that anchors the linked list of pages.
   Page* anchor() { return &anchor_; }
 
-  // Collect code size related statistics
-  void CollectCodeStatistics();
-
-  // Reset code size related statistics
-  static void ResetCodeAndMetadataStatistics(Isolate* isolate);
 
 #ifdef VERIFY_HEAP
   // Verify integrity of this space.
   virtual void Verify(ObjectVisitor* visitor);
 
   // Overridden by subclasses to verify space-specific object
   // properties (e.g., only maps or free-list nodes are in map space).
   virtual void VerifyObject(HeapObject* obj) {}
 #endif
 
@@ skipping 907 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_