RFR: 8326065: Merge Space into ContiguousSpace

[Albert Mingkun Yang]

On Fri, 16 Feb 2024 18:48:47 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> It looks like the GenerationFactory removal is something that should have previously been done.

True; I overlooked it until the removal of `SpaceClosure` in this PR.

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PR Comment: https://git.openjdk.org/jdk/pull/17891#issuecomment-1949131022