RFR: 8287596: Reorg jdk.test.lib.util.ForceGC [v11]

[Roger Riggs]

On Thu, 30 Jun 2022 18:44:30 GMT, Xue-Lei Andrew Fan <xuelei at openjdk.org> wrote:

>> This is a follow up update per comments in [JDK-8287384 PR](https://github.com/openjdk/jdk/pull/8907).  The tier1 and tier2 test in open part looks good to me.  Please help to run Mach5 just case the closed test cases are impacted.
>
> Xue-Lei Andrew Fan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update per feedback

LGTM

-------------

Marked as reviewed by rriggs (Reviewer).

PR: https://git.openjdk.org/jdk/pull/8979