RFR: 8253469: ARM32 Zero: replace usages of __sync_synchronize() with OrderAccess::fence [v3]

[Boris Ulasevich]

On Fri, 25 Sep 2020 10:07:22 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Changes seem fine to me. Good to have barriers handled only in OrderAccess.
>
>> Changes seem fine to me. Good to have barriers handled only in OrderAccess.
> 
> Thanks for review. @bulasevich, do you agree with this change?

Absolutely. The change is good.

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PR: https://git.openjdk.java.net/jdk/pull/298