RFR: 8280437: Move G1BufferNodeList to gc/shared

[Hamlin Li]

On Fri, 21 Jan 2022 18:58:47 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this simple (trivial?) change, renaming G1BufferNodeList to
> BufferNodeList and moving its files from gc/g1 to gc/shared.
> 
> Testing:
> mach5 tier1

Marked as reviewed by mli (Reviewer).

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