Fix free list construction for global property cells on x64.

Review URL: http://codereview.chromium.org/155287

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2418 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/spaces.cc

@@ -1265,7 +1265,7 @@ void FreeListNode::set_size(int size_in_bytes) {
   // If the block is too small (eg, one or two words), to hold both a size
   // field and a next pointer, we give it a filler map that gives it the
   // correct size.
-  if (size_in_bytes > ByteArray::kHeaderSize) {
+  if (size_in_bytes > ByteArray::kAlignedSize) {
     set_map(Heap::raw_unchecked_byte_array_map());
     ByteArray::cast(this)->set_length(ByteArray::LengthFor(size_in_bytes));
   } else if (size_in_bytes == kPointerSize) {