RFR: 8315031: YoungPLABSize and OldPLABSize not aligned by ObjectAlignmentInBytes [v2]

[Ivan Walulya]

On Thu, 28 Sep 2023 11:55:22 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple fix around unaligned PLAB size. Due to a circular dependency between the heap and PLAB initialization in G1, `_default_plab_size` picks up unaligned PLAB sizes, hence the additional alignment there.
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Marked as reviewed by iwalulya (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15901#pullrequestreview-1648892238