RFR: Upstream merge to jdk-13+9

[Aleksey Shipilev]

On 2/21/19 1:42 PM, Roman Kennke wrote:
> This merges jdk/jdk -> sh/jdk up to jdk-13+9 plus cherry-picks:
> "8219486: Missing reg_mask_init() breaks x86_32 build" to un-break
> x86_32 build.
> 
> All merged cleanly, tests (hotspot_gc_shenandoah) all passes here.
> 
> http://cr.openjdk.java.net/~rkennke/upstream-jdk13-merge-2019-02-21/changes.txt

OK.

-Aleksey