RFR: Upstream merge from jdk/jdk

[Aleksey Shipilev]

On 1/8/19 5:33 PM, Roman Kennke wrote:
> First merge from upstream in new world order. Merge was 0 conflict and
> trivial, everything builds+ runs just fine. It merges up to tag jdk-13+2
> 
> http://cr.openjdk.java.net/~rkennke/upstream-jdk13-merge-2019-01-08/outgoing.txt
> 
> Testing: hotspot_gc_shenandoah
> 
> Ok?

OK, but sh/jdk12 should fork first.

-Aleksey