8196485: FromCardCache default card index can cause crashes Summary: The default value of -1 for 32 bit card indices is a regular card value at the border of 2TB heap addresses in the from card cache, so G1 may loose remembered set entries. Extend from card cache entries to 64 bits. Reviewed-by: shade, sjohanss Contributed-by: Thomas Schatzl <thomas.schatzl@oracle.com>, Jarkko Miettinen <jarkko.miettinen@relex.fi>