RFR: 8277542: G1: Move G1CardSetFreePool and related classes to separate files

[Thomas Schatzl]

On Mon, 22 Nov 2021 11:38:07 GMT, Hamlin Li <mli at openjdk.org> wrote:

> As G1CardSetFreePool and related classes are going to be reused outside of the remembered set, they should be factored out.

Marked as reviewed by tschatzl (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/6499