RFR: 8298264: Merge OffsetTableContigSpace into TenuredSpace

[Albert Mingkun Yang]

On Wed, 7 Dec 2022 11:16:03 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Small change of merging two classes to reduce inheritance chain length.
> 
> Test: hotspot_gc

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/11556