Fix Win64 compilation problems introduced by r9932.

src/heap.cc

 // Copyright 2011 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 993 matching lines @@
 
 
 void PromotionQueue::RelocateQueueHead() {
   ASSERT(emergency_stack_ == NULL);
 
   Page* p = Page::FromAllocationTop(reinterpret_cast<Address>(rear_));
   intptr_t* head_start = rear_;
   intptr_t* head_end =
       Min(front_, reinterpret_cast<intptr_t*>(p->body_limit()));
 
-  int entries_count = (head_end - head_start) / kEntrySizeInWords;
+  int entries_count =
+      static_cast<int>(head_end - head_start) / kEntrySizeInWords;
 
   emergency_stack_ = new List<Entry>(2 * entries_count);
 
   while (head_start != head_end) {
-    int size = *(head_start++);
+    int size = static_cast<int>(*(head_start++));
     HeapObject* obj = reinterpret_cast<HeapObject*>(*(head_start++));
     emergency_stack_->Add(Entry(obj, size));
   }
   rear_ = head_end;
 }
 
 
 void Heap::Scavenge() {
 #ifdef DEBUG
   if (FLAG_verify_heap) VerifyNonPointerSpacePointers();
@@ skipping 5421 matching lines @@
   isolate_->heap()->store_buffer()->Compact();
   isolate_->heap()->store_buffer()->Filter(MemoryChunk::ABOUT_TO_BE_FREED);
   for (chunk = chunks_queued_for_free_; chunk != NULL; chunk = next) {
     next = chunk->next_chunk();
     isolate_->memory_allocator()->Free(chunk);
   }
   chunks_queued_for_free_ = NULL;
 }
 
 } }  // namespace v8::internal