RFR: CODETOOLS-7903210: JOL: Minor code cleanups [v2]

[Aleksey Shipilev]

On Tue, 14 Jun 2022 01:36:59 GMT, Steafan Chou <duke at openjdk.java.net> wrote:

>> Hi friends,I am studying the JOL source,i cleaned some code,thanks.
>
> Steafan Chou has updated the pull request incrementally with one additional commit since the last revision:
> 
>   revert GraphInstanceBench 49 line.

Marked as reviewed by shade (Committer).

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PR: https://git.openjdk.org/jol/pull/26