RFR [sh/8u]: Backport elimination of forwarding pointer

[Aleksey Shipilev]

On 10/28/19 6:06 PM, Roman Kennke wrote:
> Ha, and it missed the webrev link:
> http://cr.openjdk.java.net/~rkennke/nofwdptr-sh8/webrev.00/

More thorough review:

*) shenandoahBarrierSetAssembler_x86.cpp, SBSA::load_reference_barrier_not_null, why EVACUATION was
dropped here?

  91   __ testb(gc_state, ShenandoahHeap::HAS_FORWARDED);

Otherwise looks very good.

-- 
Thanks,
-Aleksey