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

[Roman Kennke]

Looks good to me!

Am 20. März 2017 10:02:59 MEZ schrieb Aleksey Shipilev <shade at redhat.com>:
>We thought it is folded under ShenandoahWriteBarrier, and some of it
>is.
>However, some paths enable SATB unconditionally, which distorts our
>differential
>performance runs.
>
>Introducing ShenandoahSATBBarriers option:
>http://cr.openjdk.java.net/~shade/shenandoah/satb-barriers-disable/webrev.02/
>
>Testing: hotspot_gc_shenandoah, benchmarks
>
>Thanks,
>-Aleksey

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