RFR: 8078743: AARCH64: Extend use of stlr to cater for volatile object stores

[Edward Nevill]

Hi Andrew,

I have tested this on two different partner platforms with G1GC, CMS and
Parallel GC with and without UseCondCardMark.

I have also reviewed the code and and happy with the code and comments.

Vladimir, if you are still happy with this may I go ahead and push this
on behalf of Andrew Dinn. The changes only affect aarch64.ad.

Many thanks,
Ed.

On Wed, 2015-08-12 at 13:45 +0100, Andrew Dinn wrote:
> Hi Vladimir,
> 
> Apologies for the delay in responding to your feedback -- I was
> traveling for a team meeting all of last week.
> 
> Here is a revised webrev which includes all the code changes you suggested
> 
>   http://cr.openjdk.java.net/~adinn/8078743/webrev.04
>