RFR: 8272609: Add string deduplication support to SerialGC [v8]

[Denghui Dong]

On Fri, 20 Aug 2021 09:34:15 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Denghui Dong 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. The pull request contains one new commit since the last revision:
>> 
>>   tidy
>
> Looks good.

@kimbarrett @walulyai @albertnetymk thanks for the review!

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PR: https://git.openjdk.java.net/jdk/pull/5153