RFR(XS): 8164038: Missing volatile keyword at CardTableRS::write_ref_field_gc_par()

[Thomas Schatzl]

Hi Sangheon,

On Tue, 2017-03-07 at 17:14 -0800, sangheon wrote:
> Hi all,
> 
> Could I have some reviews for this tiny change that adds volatile
> qualifier?
> 
> Currently without 'volatile' we don't have any problem but I would
> like to add it for the code readability.
> 

  looks good.

Thomas