RFR: 8328352: Serial: Inline SerialBlockOffsetSharedArray

[Guoxiong Li]

Hi all,

This patch merges `SerialBlockOffsetSharedArray` into `SerialBlockOffsetTable` so that the `TenureSpace` and `TenuredGeneration` can use them easily. The tests `make test-tier1_gc` passed locally.

Thanks for taking the time to review.

Best Regards,
-- Guoxiong

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Commit messages:
 - JDK-8328352

Changes: https://git.openjdk.org/jdk/pull/18501/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18501&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328352
  Stats: 114 lines in 9 files changed: 32 ins; 48 del; 34 mod
  Patch: https://git.openjdk.org/jdk/pull/18501.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18501/head:pull/18501

PR: https://git.openjdk.org/jdk/pull/18501