RFR: 8293210: G1: Remove redundant check in G1FreeHumongousRegionClosure [v2]

[Albert Mingkun Yang]

On Mon, 19 Sep 2022 10:57:12 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple change of removing unnecessary code.
>> 
>> Test: hotspot_gc
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - index-iteration
>  - Merge branch 'master' into g1-entail-2
>  - g1-entail-2

Added a micro benchmark and some results to the ticket. On my box, this PR reduces the relevant phase length by ~50%.

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PR: https://git.openjdk.org/jdk/pull/10119