Add integer casts to make v8 compile without warnings on 64-bit Visual Studio

src/spaces-inl.h

 // Copyright 2006-2008 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 165 matching lines @@
 
 Page* MemoryAllocator::GetNextPage(Page* p) {
   ASSERT(p->is_valid());
   intptr_t raw_addr = p->opaque_header & ~Page::kPageAlignmentMask;
   return Page::FromAddress(AddressFrom<Address>(raw_addr));
 }
 
 
 int MemoryAllocator::GetChunkId(Page* p) {
   ASSERT(p->is_valid());
-  return p->opaque_header & Page::kPageAlignmentMask;
+  return static_cast<int>(p->opaque_header & Page::kPageAlignmentMask);
 }
 
 
 void MemoryAllocator::SetNextPage(Page* prev, Page* next) {
   ASSERT(prev->is_valid());
   int chunk_id = GetChunkId(prev);
   ASSERT_PAGE_ALIGNED(next->address());
   prev->opaque_header = OffsetFrom(next->address()) | chunk_id;
 }
 
@@ skipping 140 matching lines @@
 
 bool FreeListNode::IsFreeListNode(HeapObject* object) {
   return object->map() == Heap::raw_unchecked_byte_array_map()
       || object->map() == Heap::raw_unchecked_one_pointer_filler_map()
       || object->map() == Heap::raw_unchecked_two_pointer_filler_map();
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_INL_H_