Reload: Don't free the saved class table while another thread may be reading it.

runtime/vm/class_table.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_CLASS_TABLE_H_
 #define VM_CLASS_TABLE_H_
 
 #include "platform/assert.h"
 #include "vm/bitfield.h"
 #include "vm/globals.h"
@@ skipping 220 matching lines @@
   static intptr_t SizeOffsetFor(intptr_t cid, bool is_new_space);
 
   ClassHeapStats* StatsWithUpdatedSize(intptr_t cid);
 
   void AllocationProfilePrintJSON(JSONStream* stream);
   void ResetAllocationAccumulators();
 
   void PrintToJSONObject(JSONObject* object);
 #endif  // !PRODUCT
 
+  void AddOldTable(RawClass** old_table);
   // Deallocates table copies. Do not call during concurrent access to table.
   void FreeOldTables();
 
   void SetTraceAllocationFor(intptr_t cid, bool trace);
   bool TraceAllocationFor(intptr_t cid);
 
  private:
   friend class GCMarker;
   friend class ScavengerVisitor;
   friend class ClassHeapStatsTestHelper;
@@ skipping 18 matching lines @@
   void UpdateLiveOld(intptr_t cid, intptr_t size, intptr_t count = 1);
   void UpdateLiveNew(intptr_t cid, intptr_t size);
 #endif  // !PRODUCT
 
   DISALLOW_COPY_AND_ASSIGN(ClassTable);
 };
 
 }  // namespace dart
 
 #endif  // VM_CLASS_TABLE_H_