RFR: 8295212: G1: Add wrapper for TruncatedSeqs that need separation by gc phase [v3]

[Thomas Schatzl]

On Tue, 25 Oct 2022 08:13:35 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:
>> 
>>  - Merge branch 'master' of https://git.openjdk.org/jdk into submit/8295212-wrapper-for-truncatedseqs2
>>  - Use correct sequence for checking mixed samples
>>  - Cleanup
>>  - Provide a class that wraps two TruncatedSeqs for young-only/mixed phase
>
> Looks good.

Thanks @kstefanj @walulyai for your reviews

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PR: https://git.openjdk.org/jdk/pull/10793