Fix reuse of free blocks and delete global cache on VM shutdown.

runtime/vm/store_buffer.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_STORE_BUFFER_H_
 #define VM_STORE_BUFFER_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 
@@ skipping 61 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(StoreBufferBlock);
 };
 
 
 class StoreBuffer {
  public:
   StoreBuffer();
   ~StoreBuffer();
   static void InitOnce();
+  static void ShutDown();
 
   // Interrupt when crossing this threshold of non-empty blocks in the buffer.
   static const intptr_t kMaxNonEmpty = 100;
 
   // Adds and transfers ownership of the block to the buffer.
   void PushBlock(StoreBufferBlock* block, bool check_threshold = true);
   // Partially filled blocks can be reused, and there is an "inifite" supply
   // of empty blocks (reused or newly allocated). In any case, the caller
   // takes ownership of the returned block.
   StoreBufferBlock* PopNonFullBlock();
@@ skipping 37 matching lines @@
   static const intptr_t kMaxGlobalEmpty = 100;
   static List* global_empty_;
   static Mutex* global_mutex_;
 
   DISALLOW_COPY_AND_ASSIGN(StoreBuffer);
 };
 
 }  // namespace dart
 
 #endif  // VM_STORE_BUFFER_H_