RFR: Minor fixes, microoptimizations and cleanup

Tue Oct 6 14:56:23 UTC 2020

On Thu, 1 Oct 2020 08:32:13 GMT, Sergey Ponomarev <github.com+415502+stokito at openjdk.org> wrote:

>> I already signed Oracle contributor agreement and I'm JCP member so my changes can be accepted.
>
> Fixed all comments

@stokito, could you please merge/rebase off the current `master`? It includes the automatically-triggered workflow with
pre-integration checks.

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PR: https://git.openjdk.java.net/jol/pull/3