RFR: 8326975: Parallel: Remove redundant PSOldGen::is_allocated [v2]

[Albert Mingkun Yang]

On Thu, 29 Feb 2024 10:04:05 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple removing redundant code, since old-gen should have been allocated in the caller context.
>> 
>> Test: tier1-3
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/18047#issuecomment-1971279683