RFR: JDK-8220780: ShenandoahBS::AccessBarrier::oop_store_in_heap_at ignores AS_NO_KEEPALIVE

[Aleksey Shipilev]

On 3/18/19 4:17 PM, Roman Kennke wrote:
> Aleksey discovered that we're ignoring AS_NO_KEEPALIVE for oop-stores.
> This is bad because it means we do extra processing for no good reason
> (enqueueing stuff in SATB) and worst case, keep stuff alive that we
> shouldn't.
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8220780
> Cure:
> http://cr.openjdk.java.net/~rkennke/JDK-8220780/webrev.00/

Seems fine.

-Aleksey