RFR: 8298169: Remove unused methods in space.hpp

[Albert Mingkun Yang]

On Tue, 6 Dec 2022 12:45:22 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial change of removing unused methods.

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/11536