RFR: Backport recent changes to shenandoah/jdk11

[Aleksey Shipilev]

On 7/31/19 6:45 PM, Roman Kennke wrote:
> Full webrev:
> http://cr.openjdk.java.net/~rkennke/backport-jdk11-2019-07-31/webrev.00/

*) x86_32 backport is slightly incorrect: there is no support for split .ad files, so new
shenandoah_x86_32.ad has no effect, and CAS code fails. Fixed like this (apply over "Shenandoah
x86_32 support" change), passes hotspot_gc_shenandoah with x86_32 afterwards:
  https://cr.openjdk.java.net/~shade/shenandoah/11u-fix-x86_32.patch
 Otherwise backports look clean. Can't wait to try it for my apps!

-- 
Thanks,
-Aleksey