FYI: Merge upstream jdk/jdk into shenandoah/jdk

[Aleksey Shipilev]

On 02/21/2018 03:59 PM, Roman Kennke wrote:
> I have not changed anything under gc/shenandoah when merging. The only
> merge conflicts have been caused by places where we used
> keep_alive_barrier() which are now replaced by the Access API (we
> should look at removing keep_alive_barrier() now), and a few places
> where I needed to change == to oopDesc::equals().

OK then.

-Aleksey