Add new atomic operations and use them in two places.

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 7099 matching lines @@
         ic_data = ICData::Clone(ic_data);
         ic_data.SetOriginal(original_ic_data);
       }
       (*deopt_id_to_ic_data)[ic_data.deopt_id()] = &ic_data;
     }
   }
 }
 
 
 void Function::set_ic_data_array(const Array& value) const {
-  StorePointer(&raw_ptr()->ic_data_array_, value.raw());
+  AtomicStorePointer(&raw_ptr()->ic_data_array_, value.raw());
 }
 
 
 RawArray* Function::ic_data_array() const {
   return raw_ptr()->ic_data_array_;
 }
 
 
 void Function::ClearICDataArray() const {
   set_ic_data_array(Array::null_array());
@@ skipping 6320 matching lines @@
   const Array& data = Array::Handle(ic_data());
   return data.IsImmutable();
 }
 
 
 void ICData::ResetData() const {
   // Number of array elements in one test entry.
   intptr_t len = TestEntryLength();
   // IC data array must be null terminated (sentinel entry).
   const Array& ic_data = Array::Handle(Array::New(len, Heap::kOld));
+  WriteSentinel(ic_data, len);
   set_ic_data_array(ic_data);
-  WriteSentinel(ic_data, len);
 }
 
 
 RawICData* ICData::New() {
   ICData& result = ICData::Handle();
   {
     // IC data objects are long living objects, allocate them in old generation.
     RawObject* raw = Object::Allocate(ICData::kClassId,
                                       ICData::InstanceSize(),
                                       Heap::kOld);
@@ skipping 9133 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart