[8] RFC: Pick up 8u232-ga to sh/jdk8

[Aleksey Shipilev]

aarch64-port/jdk8u-shenandoah integration repo now has current CPU (8u232-ga).

Let's pick it up to sh/jdk8. Since we did not have any changes in sh/jdk8 after the CPU freeze, no
merge is required, we only pick up changesets. There is no reason to list the changes here, refer to
integration repo RFR for details:
  https://mail.openjdk.java.net/pipermail/aarch64-port-dev/2019-October/008085.html

Testing: x86_64 hotspot_gc_shenandoah {fastdebug, release}

-- 
Thanks,
-Aleksey