Fix build problems on Windows 64-bit by casting.

src/circular-queue.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 40 matching lines @@
   for (int i = 0; i < buffer_size_; i += chunk_size_) {
     buffer_[i] = kClear;
   }
   buffer_[buffer_size_] = kEnd;
 
   // Layout producer and consumer position pointers each on their own
   // cache lines to avoid cache lines thrashing due to simultaneous
   // updates of positions by different processor cores.
   const int positions_size =
       RoundUp(1, kProcessorCacheLineSize) +
-      RoundUp(sizeof(ProducerPosition), kProcessorCacheLineSize) +
-      RoundUp(sizeof(ConsumerPosition), kProcessorCacheLineSize);
+      RoundUp(static_cast<int>(sizeof(ProducerPosition)),
+              kProcessorCacheLineSize) +
+      RoundUp(static_cast<int>(sizeof(ConsumerPosition)),
+              kProcessorCacheLineSize);
   positions_ = NewArray<byte>(positions_size);
 
   producer_pos_ = reinterpret_cast<ProducerPosition*>(
       RoundUp(positions_, kProcessorCacheLineSize));
   producer_pos_->enqueue_pos = buffer_;
 
   consumer_pos_ = reinterpret_cast<ConsumerPosition*>(
       reinterpret_cast<byte*>(producer_pos_) + kProcessorCacheLineSize);
   ASSERT(reinterpret_cast<byte*>(consumer_pos_ + 1) <=
          positions_ + positions_size);
@@ skipping 37 matching lines @@
 }
 
 
 void SamplingCircularQueue::FlushResidualRecords() {
   // Eliminate producer / consumer distance.
   consumer_pos_->dequeue_chunk_poll_pos = consumer_pos_->dequeue_chunk_pos;
 }
 
 
 } }  // namespace v8::internal