RFR (S): Add the option to disable Shenandoah SATB barriers

[Aleksey Shipilev]

On 03/20/2017 10:11 AM, Andrew Haley wrote:
> On 20/03/17 09:02, Aleksey Shipilev wrote:
>> Introducing ShenandoahSATBBarriers option:
>>   http://cr.openjdk.java.net/~shade/shenandoah/satb-barriers-disable/webrev.02/
> 
> Some of these changes are very intrusive in shared code.  I suppose
> that when we get a proper abstract GC interface they will all be
> abstracted away, so perhaps it doesn't matter.

Yup. And also it will get easier once we depart from piggy-backing on G1 barrier
code for e.g. pre-barriers.

Thanks,
-Aleksey