RFR: JDK-8202714: Create a MacroAssembler::access_load/store_at wrapper for AArch64

[Roman Kennke]

Thanks, Stuart!

Roman

> Hi,
>    I tried something similar for the ZGC tree (although I stepped back
> from them). Your changes look good to me. I'm not a Reviewer.
> 
> BR,
>     Stuart
> 
> On 14 May 2018 at 13:02, Roman Kennke <rkennke at redhat.com> wrote:
>> This reshuffles AArch64 code around BarrierSetAssembler calls follow the
>> equivalent code in x86:
>>
>> http://cr.openjdk.java.net/~rkennke/JDK-8202714/webrev.00/
>>
>> No regressions in hotspot/tier1
>>
>> Can I please get a review?
>>
>> Thanks, Roman
>>