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

Aleksey Shipilev shade at redhat.com
Mon Mar 20 09:02:59 UTC 2017

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:

Testing: hotspot_gc_shenandoah, benchmarks


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