RFR: StateObjectHandler.validateState(): fix typo and optimize [v2]

[Aleksey Shipilev]

On Sat, 24 Oct 2020 16:21:46 GMT, Sergey Ponomarev <github.com+415502+stokito at openjdk.org> wrote:

>> Last commit contains extract of two methods from duplicated code that IntelliJ found. Not sure if this change has any value for you so I can revert it
>
> Sergey Ponomarev has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.

Marked as reviewed by shade (Committer).

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

PR: https://git.openjdk.java.net/jmh/pull/7