RFR: Upstream merge to jdk-12+19

[Aleksey Shipilev]

On 11/08/2018 03:50 PM, Roman Kennke wrote:
> And of course, the obligatory list of changes:
> 
> http://cr.openjdk.java.net/~rkennke/upstream-jdk12-merge-2018-11-08/outgoing.txt
> 
> The new baseline would be:
> 
> changeset:   53243:dc1f9dec2018
> user:        rkennke
> date:        Wed Nov 07 20:24:44 2018 +0100
> summary:     8213469: Remove/fix leftovers from JDK-8213384: Move G1/C2
> barrier verification into G1BarrierSetC2
> 
> Ok?

New webrev script will (at least should) pick up baseline revision automatically now, no need to
track the revisions. It hinges on the property that there are no non-Shenandoah changesets in past
the merge changeset -- that is new head has to be single and has to be Shenandoah.

-Aleksey