Cherry pick native barrier related changes to shenandoah/jdk

[Zhengyu Gu]

On 7/15/19 12:40 PM, Roman Kennke wrote:
> I just pushed my last-week's merge which includes the first two of your
> cherry-picks and you may want to wait for my 8227637 cherry-pick too, so
> that we can finally have an unbroken sh/jdk.

Sure.

-Zhengyu

> 
> Roman
> 
> 
>> I would like cherry pick native barrier related changes to shenandoah/jdk.
>>
>> Cherry-pick: 8226823: Adjust BarrierSetC2 for C2 runtime calls
>> Cherry-pick: 8226822: GC interface for C1 runtime calls
>> Cherry-pick: 8226695: Shenandoah: Wire C1 and C2 IN_NATIVE barrier
>> Cherry-pick: 8225483: Shenandoah: Enhance native access barrier
>>
>> Webrev:
>> http://cr.openjdk.java.net/~zgu/shenandoah/native_barriers/webrev.00/
>>
>> Test:
>>    in progress.
>>
>> Thanks,
>>
>> -Zhengyu
>