RFR: 8253420: Refactor HeapRegionManager::find_highest_free [v2]

[Albert Mingkun Yang]

On Wed, 27 Jan 2021 00:27:27 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   review
>
> Marked as reviewed by kbarrett (Reviewer).

Thank you for the reviews.

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PR: https://git.openjdk.java.net/jdk/pull/2193