RFR: Merge upstream to tag jdk-13+11

[Aleksey Shipilev]

On 3/12/19 2:21 PM, Roman Kennke wrote:
> List of changes:
> http://cr.openjdk.java.net/~rkennke/upstream-jdk13-merge-2019-03-12/changes.txt
> 
> Testing: hotspot_gc_shenandoah ok
> 
> Ok?

OK!

-Aleksey