Merge jdk-14+5 into shenandoah/jdk

[Roman Kennke]

I noticed that jdk/jdk nightlies are having problems with recent
in_native barrier stuff. I'm gonna fix that first, and then cherry-pick
the fix right on top of the merge.

Roman


> On 7/12/19 2:26 PM, Roman Kennke wrote:
>> As $SUBJECT says. No conflicts, tests (hotspot_gc_shenandoah) all good.
>>
>> List of changes:
>> http://cr.openjdk.java.net/~rkennke/upstream-jdk14-merge-2019-07-12/changes.txt
> 
> Looks good.
>