RFR: JDK-8231583: Shenandoah: Fix register clash in SBSA::resolve_forwarding_pointer() borrowing

[Aleksey Shipilev]

On 9/30/19 4:57 PM, Roman Kennke wrote:
> http://cr.openjdk.java.net/~rkennke/JDK-8231583/webrev.01/

I believe at this point we should be doing a very safe change that does not include collateral cleanups:
  http://cr.openjdk.java.net/~shade/8231583/webrev.01/

Testing: hotspot_gc_shenandoah {x86_32, x86_64, aarch64}

-- 
Thanks,
-Aleksey