Fix for issue 4848 (Added missing store buffer updates when storing an object reference into anothe…

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2655 matching lines @@
 
    private:
     const uword pc_;
 
     DISALLOW_COPY_AND_ASSIGN(FindRawCodeVisitor);
   };
 
   static const intptr_t kEntrySize = sizeof(int32_t);  // NOLINT
 
   void set_instructions(RawInstructions* instructions) {
+    // RawInstructions are never allocated in New space and hence a
+    // store buffer update is not needed here.
     raw_ptr()->instructions_ = instructions;
   }
   void set_pointer_offsets_length(intptr_t value) {
     ASSERT(value >= 0);
     raw_ptr()->pointer_offsets_length_ = value;
   }
   int32_t* PointerOffsetAddrAt(int index) const {
     ASSERT(index >= 0);
     ASSERT(index < pointer_offsets_length());
     // TODO(iposva): Unit test is missing for this functionality.
@@ skipping 2859 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_