RFR: 8280437: Move G1BufferNodeList to gc/shared [v2]

[Kim Barrett]

On Mon, 24 Jan 2022 09:12:13 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Kim Barrett has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
>> 
>>  - Merge branch 'master' into rename-bnl
>>  - rename G1BufferNodeList
>
> Lgtm!

Thanks @walulyai , @Hamlin-Li , and @kstefanj for reviews.

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PR: https://git.openjdk.java.net/jdk/pull/7183