Add new atomic operations and use them in two places.

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 628 matching lines @@
   //
   // All writes to heap objects should ultimately pass through one of the
   // methods below or their counterparts in RawObject, to ensure that the
   // write barrier is correctly applied.
 
   template<typename type>
   void StorePointer(type const* addr, type value) const {
     raw()->StorePointer(addr, value);
   }
 
+  template<typename type>
+  void AtomicStorePointer(type const* addr, type value) const {
+    raw()->AtomicStorePointer(addr, value);
+  }
+
   // Store a range of pointers [from, from + count) into [to, to + count).
   // TODO(koda): Use this to fix Object::Clone's broken store buffer logic.
   void StorePointers(RawObject* const* to,
                      RawObject* const* from,
                      intptr_t count) {
     ASSERT(Contains(reinterpret_cast<uword>(to)));
     if (raw()->IsNewObject()) {
       memmove(const_cast<RawObject**>(to), from, count * kWordSize);
     } else {
       for (intptr_t i = 0; i < count; ++i) {
@@ skipping 7999 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_