RFR: 8319439: Move BufferNode from PtrQueue files to new files [v2]

[Kim Barrett]

On Tue, 7 Nov 2023 11:19:03 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Kim Barrett 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' into buffer-node
>>  - fixup gtest after rename
>>  - move test
>>  - move BufferNode to new files
>
> lgtm

Thanks @tschatzl and @walulyai for reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/16506#issuecomment-1811638624