RFR: 8232689: Remove ParCompactionManager::Action enum

[Kim Barrett]

> On Jan 28, 2020, at 3:05 AM, Ivan Walulya <ivan.walulya at oracle.com> wrote:
> 
> Hi all,
> 
> Please review the removal of unused Enum from the parallel GC. 
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8232689 <https://bugs.openjdk.java.net/browse/JDK-8232689>
> Webrev: http://cr.openjdk.java.net/~lkorinth/ivan/8232689/ <http://cr.openjdk.java.net/~lkorinth/ivan/8232689/>
> 
> Testing: Tier 1 - Tier 3
> 
> //Ivan

Looks good.